diff --git a/installer.go b/installer.go
index 57c4f2f..0146ac7 100644
--- a/installer.go
+++ b/installer.go
@@ -109,6 +109,13 @@ func (inst *Installer) doFinalInstall() {
 			return
 		}
 
+		// Register the app in Windows (i.e. create registry entries)
+		spm.UpdateProgress(0, "Registering app...")
+		if err := spm.RegisterApp(); err != nil {
+			inst.LastError = err
+			return
+		}
+
 		spm.UpdateProgress(100, "Installation complete!")
 	}()
 }
diff --git a/main.go b/main.go
index a267f20..bcb1225 100644
--- a/main.go
+++ b/main.go
@@ -1,9 +1,11 @@
 package main
 
 import (
+	"flag"
 	"fmt"
-	"math"
 	"os"
+	"time"
+
 	"spitfire-installer/spm"
 
 	rl "github.com/gen2brain/raylib-go/raylib"
@@ -30,7 +32,14 @@ var (
 const finalStep = 3
 
 func main() {
-	spm.Run()
+	// Check for the --silent flag.
+	silent := flag.Bool("silent", false, "run installer without GUI")
+	flag.Parse()
+
+	if *silent {
+		runSilent()
+		return
+	}
 
 	monitor := rl.GetCurrentMonitor()
 	if monitor < 0 {
@@ -96,8 +105,8 @@ func main() {
 			radius := float32(30)
 			dx := mousePos.X - topRightX
 			dy := mousePos.Y - topRightY
-			dist := float32(math.Sqrt(float64(dx*dx + dy*dy)))
-			if dist < radius+30 {
+			dist := float32((dx*dx + dy*dy))
+			if dist < (radius+30)*(radius+30) {
 				textHoverFade += 0.1
 				if textHoverFade > 1 {
 					textHoverFade = 1
@@ -161,6 +170,36 @@ func main() {
 	}
 }
 
+func runSilent() {
+	fmt.Println("Running installer in silent mode (default values will be used).")
+
+	// Start the download+decompress phase.
+	installer.StartDownloadDecompress()
+
+	// Poll until the download/decompression phase is done.
+	for !installer.DoneDownload {
+		time.Sleep(1 * time.Second)
+	}
+
+	// Start the final installation.
+	installer.FinalInstall()
+
+	// Poll until installation is finished.
+	for !installer.DoneInstall {
+		time.Sleep(1 * time.Second)
+	}
+
+	if installer.LastError != nil {
+		fmt.Printf("Installation failed: %v\n", installer.LastError)
+		os.Exit(1)
+	}
+
+	fmt.Println("Installation complete!")
+	// Optionally launch the app after install:
+	// spm.Run() or another function if needed.
+	os.Exit(0)
+}
+
 func handleInput(mousePos rl.Vector2, screenW, screenH, buttonW, buttonH int, prevX, prevY, nextX, nextY int32) {
 	switch currentStep {
 	case 0:
@@ -211,7 +250,7 @@ func drawHeader(screenW int) {
 }
 
 // Now we pass "displayProgress" (0..100) as a float, "posAlpha" in [0..1],
-// plus "doneInstall" to show the "Run App" button
+// plus "doneInstall" to show the "Run App" button.
 func drawInstallCircle(screenW, screenH int, posAlpha, displayProgress float32, doneInstall bool, hoverAlpha float32) {
 	// Lerp position/radius
 	topRight := rl.Vector2{X: float32(screenW - 80), Y: 100}
@@ -251,7 +290,7 @@ func drawInstallCircle(screenW, screenH int, posAlpha, displayProgress float32,
 	}
 }
 
-// "Run App" button logic is the same
+// "Run App" button logic is the same.
 func drawRunAppButton(cx, cy float32) {
 	w := float32(180)
 	h := float32(50)
@@ -259,7 +298,8 @@ func drawRunAppButton(cx, cy float32) {
 	hovered := overRect(rl.GetMousePosition(), rect)
 	drawRoundedRectButton(rect, "Start Spitfire", 1.0, hovered)
 	if hovered && rl.IsMouseButtonPressed(rl.MouseLeftButton) {
-		fmt.Println("Launching the app (placeholder)...")
+		fmt.Println("Launching...")
+		spm.Run()
 		os.Exit(0)
 	}
 }
@@ -346,85 +386,3 @@ func startTransition(from, to int) {
 	targetStep = to
 	transition.Start(from, to)
 }
-
-// SPM example
-
-// package main
-
-// import (
-// 	"fmt"
-// 	"os"
-// 	"path/filepath"
-// 	"spitfire-installer/spm"
-// 	"time"
-// )
-
-// func main() {
-// 	// Start a goroutine to display progress updates
-// 	done := make(chan bool)
-// 	go func() {
-// 		for {
-// 			select {
-// 			case <-done:
-// 				return
-// 			default:
-// 				percentage, task := spm.GetProgress()
-// 				fmt.Printf("\r[%3d%%] %s", percentage, task)
-// 				time.Sleep(500 * time.Millisecond)
-// 			}
-// 		}
-// 	}()
-
-// 	// Set up the download directory
-// 	downloadDir := spm.GetTempDownloadDir()
-// 	fmt.Println("\nTemporary download directory:", downloadDir)
-
-// 	// Download the APPINDEX
-// 	appIndexPath := filepath.Join(downloadDir, "APPINDEX")
-// 	spm.UpdateProgress(0, "Starting APPINDEX download")
-// 	if err := spm.DownloadAppIndex(appIndexPath); err != nil {
-// 		fmt.Println("\nError downloading APPINDEX:", err)
-// 		done <- true
-// 		os.Exit(1)
-// 	}
-
-// 	// Download the desired package version (e.g., nightly)
-// 	packageName := "spitfire-browser"
-// 	release := "nightly"
-
-// 	spm.UpdateProgress(0, "Starting package download")
-// 	if err := spm.DownloadPackageFromAppIndex(appIndexPath, packageName, release, downloadDir); err != nil {
-// 		fmt.Println("\nError downloading package:", err)
-// 		done <- true
-// 		os.Exit(1)
-// 	}
-
-// 	// Decompress and install
-// 	packagePath := filepath.Join(downloadDir, "browser-amd64-nightly-linux.tar.gz")
-// 	spm.UpdateProgress(0, "Starting decompression")
-// 	tempDir, err := spm.DecompressToTemp(packagePath)
-// 	if err != nil {
-// 		fmt.Println("\nError decompressing package:", err)
-// 		done <- true
-// 		os.Exit(1)
-// 	}
-// 	fmt.Println("\nDecompressed package to:", tempDir)
-
-// 		// Generate default install directory
-// 		installDir, err := spm.GetDefaultInstallDir()
-// 		if err != nil {
-// 			inst.LastError = fmt.Errorf("failed to determine default install directory: %w", err)
-// 			return
-// 		}
-
-// 	spm.UpdateProgress(0, "Starting installation")
-// 	if err := spm.MoveFilesToInstallDir(tempDir, installDir); err != nil {
-// 		fmt.Println("\nError installing package:", err)
-// 		done <- true
-// 		os.Exit(1)
-// 	}
-
-// 	// Notify progress display to stop and finalize
-// 	done <- true
-// 	fmt.Printf("\nSuccessfully installed %s (%s) to %s\n", packageName, release, installDir)
-// }
diff --git a/spm/decompress.go b/spm/decompress.go
index dcfb9f8..7f7a207 100644
--- a/spm/decompress.go
+++ b/spm/decompress.go
@@ -10,7 +10,7 @@ import (
 	"strings"
 )
 
-// DecompressPackage determines the package format and decompresses it
+// DecompressPackage now passes UpdateProgress to decompressTarGz.
 func DecompressPackage(downloadDir, packageName, arch, osName, pkgType, release, version string) (string, error) {
 	// 1) Construct the .tar.gz name
 	expectedFileName := fmt.Sprintf(
@@ -35,7 +35,7 @@ func DecompressPackage(downloadDir, packageName, arch, osName, pkgType, release,
 	}
 
 	// 3) Decompress everything into `decompressDir`
-	if err := decompressTarGz(packagePath, decompressDir); err != nil {
+	if err := decompressTarGz(packagePath, decompressDir, UpdateProgress); err != nil {
 		return "", fmt.Errorf("failed to decompress: %w", err)
 	}
 
@@ -43,14 +43,28 @@ func DecompressPackage(downloadDir, packageName, arch, osName, pkgType, release,
 	return decompressDir, nil
 }
 
-func decompressTarGz(srcFile, destDir string) error {
+// decompressTarGz takes an additional updateProgress callback to report progress.
+func decompressTarGz(srcFile, destDir string, updateProgress func(int, string)) error {
 	f, err := os.Open(srcFile)
 	if err != nil {
 		return err
 	}
 	defer f.Close()
 
-	gzr, err := gzip.NewReader(f)
+	fileInfo, err := f.Stat()
+	if err != nil {
+		return err
+	}
+	totalSize := fileInfo.Size()
+
+	// Wrap the file reader so we can track progress.
+	progressReader := &ProgressReader{
+		Reader:   f,
+		Total:    totalSize,
+		Callback: updateProgress,
+	}
+
+	gzr, err := gzip.NewReader(progressReader)
 	if err != nil {
 		return err
 	}
@@ -73,6 +87,11 @@ func decompressTarGz(srcFile, destDir string) error {
 				return err
 			}
 		case tar.TypeReg:
+			outPath := filepath.Join(destDir, header.Name)
+			// Ensure the parent directory exists
+			if err := os.MkdirAll(filepath.Dir(outPath), 0755); err != nil {
+				return err
+			}
 			outFile, err := os.Create(outPath)
 			if err != nil {
 				return err
@@ -83,8 +102,38 @@ func decompressTarGz(srcFile, destDir string) error {
 				return err
 			}
 		default:
-			// huh
+			// ignoring other types for now
+		}
+
+		// Update progress after extracting each file.
+		if updateProgress != nil {
+			percent := int((progressReader.BytesRead * 100) / totalSize)
+			updateProgress(percent, fmt.Sprintf("Extracted: %s", header.Name))
 		}
 	}
+
+	// Final update: extraction complete.
+	if updateProgress != nil {
+		updateProgress(100, "Extraction complete")
+	}
+
 	return nil
 }
+
+// ProgressReader wraps an io.Reader to count bytes and update progress.
+type ProgressReader struct {
+	io.Reader
+	Total     int64
+	BytesRead int64
+	Callback  func(int, string)
+}
+
+func (pr *ProgressReader) Read(p []byte) (int, error) {
+	n, err := pr.Reader.Read(p)
+	pr.BytesRead += int64(n)
+	if pr.Callback != nil && pr.Total > 0 {
+		percent := int((pr.BytesRead * 100) / pr.Total)
+		pr.Callback(percent, "Decompressing...")
+	}
+	return n, err
+}
diff --git a/spm/register_unix.go b/spm/register_unix.go
new file mode 100644
index 0000000..6568edd
--- /dev/null
+++ b/spm/register_unix.go
@@ -0,0 +1,17 @@
+// run_default.go
+//go:build !windows
+// +build !windows
+
+package spm
+
+import "fmt"
+
+// RegisterApp is not supported on non-Windows platforms.
+func RegisterApp() error {
+	return fmt.Errorf("RegisterApp is only available on Windows")
+}
+
+// UnregisterApp is not supported on non-Windows platforms.
+func UnregisterApp() error {
+	return fmt.Errorf("UnregisterApp is only available on Windows")
+}
diff --git a/spm/register_win.go b/spm/register_win.go
new file mode 100644
index 0000000..b2cf47f
--- /dev/null
+++ b/spm/register_win.go
@@ -0,0 +1,135 @@
+// run_windows.go
+//go:build windows
+// +build windows
+
+package spm
+
+import (
+	"fmt"
+
+	"golang.org/x/sys/windows/registry"
+)
+
+// RegisterApp writes the necessary registry keys, making it appear as offically installed app
+func RegisterApp() error {
+	exePath, err := GetInstallDir()
+	if err != nil {
+		return fmt.Errorf("failed to get install directory: %w", err)
+	}
+
+	// 1. Create Uninstall/Modify entry
+	uninstallKeyPath := `Software\Microsoft\Windows\CurrentVersion\Uninstall\SpitfireBrowser`
+	uk, _, err := registry.CreateKey(registry.LOCAL_MACHINE, uninstallKeyPath, registry.ALL_ACCESS)
+	if err != nil {
+		return fmt.Errorf("failed to create uninstall key: %w", err)
+	}
+	defer uk.Close()
+
+	if err := uk.SetStringValue("DisplayName", "Spitfire"); err != nil {
+		return err
+	}
+	if err := uk.SetStringValue("UninstallString", exePath+" --uninstall"); err != nil {
+		return err
+	}
+	if err := uk.SetStringValue("ModifyPath", exePath+" --modify"); err != nil {
+		return err
+	}
+	if err := uk.SetStringValue("DisplayIcon", exePath); err != nil {
+		return err
+	}
+
+	// 2. Register as a browser for default apps
+	clientKeyPath := `Software\Clients\StartMenuInternet\SpitfireBrowser`
+	ck, _, err := registry.CreateKey(registry.LOCAL_MACHINE, clientKeyPath, registry.ALL_ACCESS)
+	if err != nil {
+		return fmt.Errorf("failed to create client key: %w", err)
+	}
+	defer ck.Close()
+
+	if err := ck.SetStringValue("", "Spitfire"); err != nil {
+		return err
+	}
+
+	// Create Capabilities subkey
+	capabilitiesKeyPath := clientKeyPath + `\Capabilities`
+	capk, _, err := registry.CreateKey(registry.LOCAL_MACHINE, capabilitiesKeyPath, registry.ALL_ACCESS)
+	if err != nil {
+		return fmt.Errorf("failed to create capabilities key: %w", err)
+	}
+	defer capk.Close()
+
+	if err := capk.SetStringValue("ApplicationName", "Spitfire"); err != nil {
+		return err
+	}
+	if err := capk.SetStringValue("ApplicationDescription", "A custom browser"); err != nil {
+		return err
+	}
+
+	// Set file associations
+	assocKeyPath := capabilitiesKeyPath + `\FileAssociations`
+	ak, _, err := registry.CreateKey(registry.LOCAL_MACHINE, assocKeyPath, registry.ALL_ACCESS)
+	if err != nil {
+		return fmt.Errorf("failed to create file associations key: %w", err)
+	}
+	defer ak.Close()
+
+	associations := map[string]string{
+		".html": "SpitfireBrowserHTML",
+		"HTTP":  "SpitfireBrowserHTML",
+		"HTTPS": "SpitfireBrowserHTML",
+	}
+	for ext, progID := range associations {
+		if err := ak.SetStringValue(ext, progID); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// UnregisterApp removes the registry entries created by registerApp.
+func UnregisterApp() error {
+	// Remove the Uninstall/Modify entry.
+	uninstallKeyPath := `Software\Microsoft\Windows\CurrentVersion\Uninstall\SpitfireBrowser`
+	if err := deleteRegistryTree(registry.LOCAL_MACHINE, uninstallKeyPath); err != nil {
+		return fmt.Errorf("failed to delete uninstall key: %w", err)
+	}
+
+	// Remove the browser registration entry.
+	clientKeyPath := `Software\Clients\StartMenuInternet\SpitfireBrowser`
+	if err := deleteRegistryTree(registry.LOCAL_MACHINE, clientKeyPath); err != nil {
+		return fmt.Errorf("failed to delete client key: %w", err)
+	}
+
+	return nil
+}
+
+// deleteRegistryTree recursively deletes a registry key and all its subkeys.
+func deleteRegistryTree(root registry.Key, path string) error {
+	// Open the key with ALL_ACCESS permissions.
+	key, err := registry.OpenKey(root, path, registry.ALL_ACCESS)
+	if err != nil {
+		// If the key does not exist, there's nothing to do.
+		if err == registry.ErrNotExist {
+			return nil
+		}
+		return err
+	}
+	// Read the names of all subkeys.
+	subKeys, err := key.ReadSubKeyNames(-1)
+	key.Close() // Close the key so it can be deleted later.
+	if err != nil {
+		return err
+	}
+
+	// Recursively delete each subkey.
+	for _, subKey := range subKeys {
+		subKeyPath := path + `\` + subKey
+		if err := deleteRegistryTree(root, subKeyPath); err != nil {
+			return err
+		}
+	}
+
+	// Finally, delete the (now empty) key.
+	return registry.DeleteKey(root, path)
+}
diff --git a/spm/run_unix.go b/spm/run_unix.go
new file mode 100644
index 0000000..cc82b79
--- /dev/null
+++ b/spm/run_unix.go
@@ -0,0 +1,74 @@
+// run_unix.go
+//go:build !windows
+// +build !windows
+
+package spm
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"syscall"
+)
+
+// Run locates and starts the installed Spitfire browser without waiting for it to exit.
+func Run() error {
+	installDir, err := GetInstallDir()
+	if err != nil {
+		return err
+	}
+
+	exePath := filepath.Join(installDir, "browser", "spitfire.exe")
+	if runtime.GOOS != "windows" {
+		exePath = filepath.Join(installDir, "browser", "spitfire")
+	}
+
+	cmd := exec.Command(exePath)
+	cmd.Dir = filepath.Join(installDir, "browser")
+	return cmd.Start()
+}
+
+// RunAndWait locates and starts the installed Spitfire browser and waits for it to exit.
+func RunAndWait() error {
+	installDir, err := GetInstallDir()
+	if err != nil {
+		return fmt.Errorf("failed to get install directory: %w", err)
+	}
+
+	// Construct the browser executable path
+	exePath := filepath.Join(installDir, "browser", "spitfire")
+	if _, err := os.Stat(exePath); err != nil {
+		return fmt.Errorf("browser executable not found at %s: %w", exePath, err)
+	}
+
+	cmd := exec.Command(exePath)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	// Start the process in a new process group
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		Setpgid: true,
+	}
+
+	fmt.Printf("Starting browser: %s\n", exePath)
+	if err := cmd.Start(); err != nil {
+		return fmt.Errorf("failed to start browser: %w", err)
+	}
+
+	// Print PID and PGID for debugging
+	pgid, err := syscall.Getpgid(cmd.Process.Pid)
+	if err == nil {
+		fmt.Printf("Browser process started with PID %d (PGID %d)\n", cmd.Process.Pid, pgid)
+	} else {
+		fmt.Printf("Browser process started with PID %d\n", cmd.Process.Pid)
+	}
+
+	if err := cmd.Wait(); err != nil {
+		return fmt.Errorf("browser exited with error: %w", err)
+	}
+
+	fmt.Println("Browser exited successfully.")
+	return nil
+}
diff --git a/spm/run.go b/spm/run_win.go
similarity index 75%
rename from spm/run.go
rename to spm/run_win.go
index 5c6ce34..d1f2b38 100644
--- a/spm/run.go
+++ b/spm/run_win.go
@@ -1,71 +1,68 @@
-package spm
-
-import (
-	"fmt"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"runtime"
-)
-
-// Run locates and starts the installed Spitfire browser without waiting for it to exit.
-func Run() error {
-	installDir, err := GetInstallDir()
-	if err != nil {
-		return err
-	}
-
-	exePath := filepath.Join(installDir, "browser", "spitfire.exe")
-	if runtime.GOOS != "windows" {
-		exePath = filepath.Join(installDir, "browser", "spitfire")
-	}
-
-	cmd := exec.Command(exePath)
-	cmd.Dir = filepath.Join(installDir, "browser")
-	return cmd.Start()
-}
-
-// RunAndWait locates and starts the installed Spitfire browser and waits for it to exit.
-func RunAndWait() error {
-	installDir, err := GetInstallDir()
-	if err != nil {
-		return fmt.Errorf("failed to get install directory: %w", err)
-	}
-
-	// Construct the browser executable path
-	exePath := filepath.Join(installDir, "browser", "spitfire.exe")
-	if runtime.GOOS != "windows" {
-		exePath = filepath.Join(installDir, "browser", "spitfire")
-	}
-
-	// Check if the browser executable exists
-	if _, err := os.Stat(exePath); err != nil {
-		return fmt.Errorf("browser executable not found at %s: %w", exePath, err)
-	}
-
-	// Create the command
-	cmd := exec.Command(exePath)
-
-	// Attach standard output and error for debugging
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
-
-	// Start the browser process
-	fmt.Printf("Starting browser: %s\n", exePath)
-	err = cmd.Start()
-	if err != nil {
-		return fmt.Errorf("failed to start browser: %w", err)
-	}
-
-	// Print the PID for debugging
-	fmt.Printf("Browser process started with PID %d\n", cmd.Process.Pid)
-
-	// Wait for the process to exit
-	err = cmd.Wait()
-	if err != nil {
-		return fmt.Errorf("browser exited with error: %w", err)
-	}
-
-	fmt.Println("Browser exited successfully.")
-	return nil
-}
+// run_windows.go
+//go:build windows
+// +build windows
+
+package spm
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"syscall"
+)
+
+// Run locates and starts the installed Spitfire browser without waiting for it to exit.
+func Run() error {
+	installDir, err := GetInstallDir()
+	if err != nil {
+		return err
+	}
+
+	exePath := filepath.Join(installDir, "browser", "spitfire.exe")
+	if runtime.GOOS != "windows" {
+		exePath = filepath.Join(installDir, "browser", "spitfire")
+	}
+
+	cmd := exec.Command(exePath)
+	cmd.Dir = filepath.Join(installDir, "browser")
+	return cmd.Start()
+}
+
+// RunAndWait locates and starts the installed Spitfire browser and waits for it to exit.
+func RunAndWait() error {
+	installDir, err := GetInstallDir()
+	if err != nil {
+		return fmt.Errorf("failed to get install directory: %w", err)
+	}
+
+	// Construct the browser executable path
+	exePath := filepath.Join(installDir, "browser", "spitfire.exe")
+	if _, err := os.Stat(exePath); err != nil {
+		return fmt.Errorf("browser executable not found at %s: %w", exePath, err)
+	}
+
+	cmd := exec.Command(exePath)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	// Use CREATE_NEW_PROCESS_GROUP flag for Windows
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		CreationFlags: syscall.CREATE_NEW_PROCESS_GROUP,
+	}
+
+	fmt.Printf("Starting browser: %s\n", exePath)
+	if err := cmd.Start(); err != nil {
+		return fmt.Errorf("failed to start browser: %w", err)
+	}
+
+	fmt.Printf("Browser process started with PID %d\n", cmd.Process.Pid)
+
+	if err := cmd.Wait(); err != nil {
+		return fmt.Errorf("browser exited with error: %w", err)
+	}
+
+	fmt.Println("Browser exited successfully.")
+	return nil
+}