Downgrade From Windows 7 Ultimate To Professional Or Home Premium Edition Using Windows 7 Downgrader

Comments

1. Uday says

   December 2, 2013 at 5:01 pm

   I’ve tried to downgrade from Enterprise edition to professional using this procedure but facing same problems as Larry.

2. Kingsley says

   May 29, 2013 at 9:34 pm

   It seems that SP1 conflict with this hack. So you need to uninstall SP1 first. But in my case, I installed from a DVD of Windows-7 that already included SP1, so I cannot uninstall SP1. I will have to bite the bullet and reinstall everything.

3. Jon says

   May 3, 2012 at 8:51 pm

   I got that error message to start with, but once I unzipped the exe and ran it as an administrator, it made the changes and the “upgrade” worked fine

4. MF says

   October 16, 2011 at 10:05 pm

   Larry did you ever get an answer because I am having the SAME problem??

5. Larry says

   September 1, 2011 at 10:41 pm

   I’ve tried a dozen different iterations of this process — manually changed registry entries for product/edition, ran program as user and as administrator, etc. I have licensed Win7 Pro & Home Premium and am trying to downgrade from Enterprise. But the downgrader program always produces the following error message. Is there a simple fix?? Hoping you can help. THANKS!!
   *************
   Unhandled exception has occurred in your application….

   Access to the registry key
   ‘HKEY_LOAL_MACHINE\SOFTWARE\Microstof\Windows NT\Curent Version’ is denied.

   See the end of this message for details on invoking
   just-in-time (JIT) debugging instead of this dialog box.

   ************** Exception Text **************
   System.UnauthorizedAccessException: Access to the registry key ‘HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion’ is denied.
   at Microsoft.Win32.RegistryKey.Win32Error(Int32 errorCode, String str)
   at Microsoft.Win32.RegistryKey.CreateSubKey(String subkey, RegistryKeyPermissionCheck permissionCheck, RegistrySecurity registrySecurity)
   at Microsoft.Win32.Registry.SetValue(String keyName, String valueName, Object value, RegistryValueKind valueKind)
   at Windows_7_Downgrader.Form1.Button3_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

   ************** Loaded Assemblies **************
   mscorlib
   Assembly Version: 2.0.0.0
   Win32 Version: 2.0.50727.5446 (Win7SP1GDR.050727-5400)
   CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v2.0.50727/mscorlib.dll
   —————————————-
   Windows 7 Downgrader
   Assembly Version: 1.0.0.0
   Win32 Version: 1.0.0.0
   CodeBase: file:///C:/Users/Larry/Downloads/Windows%207%20Downgrader.exe
   —————————————-
   Microsoft.VisualBasic
   Assembly Version: 8.0.0.0
   Win32 Version: 8.0.50727.5420 (Win7SP1.050727-5400)
   CodeBase: file:///C:/Windows/assembly/GAC_MSIL/Microsoft.VisualBasic/8.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualBasic.dll
   —————————————-
   System
   Assembly Version: 2.0.0.0
   Win32 Version: 2.0.50727.5447 (Win7SP1GDR.050727-5400)
   CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
   —————————————-
   System.Windows.Forms
   Assembly Version: 2.0.0.0
   Win32 Version: 2.0.50727.5446 (Win7SP1GDR.050727-5400)
   CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
   —————————————-
   System.Drawing
   Assembly Version: 2.0.0.0
   Win32 Version: 2.0.50727.5420 (Win7SP1.050727-5400)
   CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
   —————————————-
   System.Runtime.Remoting
   Assembly Version: 2.0.0.0
   Win32 Version: 2.0.50727.5420 (Win7SP1.050727-5400)
   CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Runtime.Remoting/2.0.0.0__b77a5c561934e089/System.Runtime.Remoting.dll
   —————————————-

6. jone says

   March 31, 2011 at 4:41 pm

   I face the error message “bad image” when i run windows professional cd exe. any idea to solve this problem?