diff --git a/functions/microwin/Invoke-Microwin.ps1 b/functions/microwin/Invoke-Microwin.ps1
index e09f8578..cd91ab11 100644
--- a/functions/microwin/Invoke-Microwin.ps1
+++ b/functions/microwin/Invoke-Microwin.ps1
@@ -404,10 +404,6 @@ public class PowerManagement {
         Write-Host "Showing file extensions..."
         reg add "HKLM\zNTUSER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v "HideFileExt" /t REG_DWORD /d 0 /f
 
-        Write-Host "Changing theme to dark."
-        reg add "HKLM\zNTUSER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize" /v "AppsUseLightTheme" /t REG_DWORD /d 0 /f
-        reg add "HKLM\zNTUSER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize" /v "SystemUsesLightTheme" /t REG_DWORD /d 0 /f
-
         if ((Microwin-TestCompatibleImage $imgVersion $([System.Version]::new(10,0,21996,1))) -eq $false) {
             # We're dealing with Windows 10. Configure sane desktop settings. NOTE: even though stuff to disable News and Interests is there,
             # it doesn't seem to work, and I don't want to waste more time dealing with an operating system that will lose support in a year (2025)
diff --git a/functions/microwin/Microwin-NewFirstRun.ps1 b/functions/microwin/Microwin-NewFirstRun.ps1
index 0fe6ff1d..2cbf842d 100644
--- a/functions/microwin/Microwin-NewFirstRun.ps1
+++ b/functions/microwin/Microwin-NewFirstRun.ps1
@@ -103,6 +103,35 @@ function Microwin-NewFirstRun {
     reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Start" /v ShowRecentList /t REG_DWORD /d 0 /f
     reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v Start_TrackDocs /t REG_DWORD /d 0 /f
 
+    # Color Modes -- requires sending messages to apply to everything
+    reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize" /v "AppsUseLightTheme" /t REG_DWORD /d 0 /f
+    reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize" /v "SystemUsesLightTheme" /t REG_DWORD /d 0 /f
+
+    # Send the WM_SETTINGCHANGE message to all windows
+    Add-Type -TypeDefinition @"
+using System;
+using System.Runtime.InteropServices;
+public class Win32 {
+    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
+    public static extern IntPtr SendMessageTimeout(
+        IntPtr hWnd,
+        uint Msg,
+        IntPtr wParam,
+        string lParam,
+        uint fuFlags,
+        uint uTimeout,
+        out IntPtr lpdwResult);
+}
+"@
+
+    $HWND_BROADCAST = [IntPtr]0xffff
+    $WM_SETTINGCHANGE = 0x1A
+    $SMTO_ABORTIFHUNG = 0x2
+    $timeout = 100
+
+    # Send the broadcast message to all windows
+    [Win32]::SendMessageTimeout($HWND_BROADCAST, $WM_SETTINGCHANGE, [IntPtr]::Zero, "ImmersiveColorSet", $SMTO_ABORTIFHUNG, $timeout, [ref]([IntPtr]::Zero))
+
     Clear-Host
     Write-Host "The taskbar will take around a minute to show up, but you can start using your computer now. Try pressing the Windows key to open the Start menu, or Windows + E to launch File Explorer."
     Start-Sleep -Seconds 10