Disable and Remove Windows Genuine Advantage

Official Method by Microsoft – more information here.

First Method

1. Lauch 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.

Note: With this method, you may be prompted to install WGA Notifications again which can still be unselected.