Kill WGA WIndows XP

1. Use regedit and goto
\HKEY_LOCAL_MACHINES\SOFTWARE
\Microsoft\WindowsNT
\CurrentVersion
\Winlogon\Notify
delete folder "Wgalogon" and all the contents

2. set your system folders to unhide Folder view or you won't see dllcache folder (Windows Explorer-Tools-Folder Options-View-hidden files and folders-show hidden files and folders)
3. go to c:\windows\system32,
rename WgaTray.exe to WgaTray.exeold
rename Wgalogon.dll to Wgalogon.dllold

4. go to c:\windows\system32\dllcache, rename WgaTray.exe to WgaTray.exeold (kalo ada, kalo ngga ada cuekin)

5. kill wgatray.exe from TASK MANAGER (teken Ctrl+Alt_Del). Done.

If still have problems, reboot the computer and login to windows xp in safe mode and repeat the above steps