How to manually remove the WGA notification

ssue

My windows desktop became black color and unable to set a desktop wallpaper permanently. Also I'm getting a notification message that this windows is not the genuine one.
Please give me a resolution to resolve this problem....

Solution

If you have a valid copy of Windows - You can do the following:

• 1.Launch Windows Task Manager.
• 2.End wgatray.exe process in Task Manager.
• 3.Restart Windows XP in Safe Mode.
• 4.Delete WgaTray.exe from c:\Windows\System32.
• 5.Delete WgaTray.exe from c:\Windows\System32\dllcache.
• 6.Lauch RegEdit.
• 7.Browse to the following location:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify

• 8.Delete the folder "WgaLogon" and all its contents
• 9.Reboot Windows XP.