For those of you who either fear for your privacy, or don't like being annoyed because you pirated your Windows copy, Old Os has come to the rescue again. We have found a workaround to the WGA notification tool that Microsoft deployed as a "critical update" a week or so ago. Make sure to make backups of the files, just in case, it's not my fault it you break something!
Now that you've made your backups, do the following:
2) Boot into Safe Mode
3) Kill the "wgatray.exe" process using Task Manager (CTRL+ALT+ESC), if it's running
4) Delete WgaTray.exe from c:\windows\system32
5) Delete WgaTray.exe from c:\windows\system32\dllcache
6) Run regedit.exe and delete the folder "WGALOGON" located in the following location: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ Windows NT\CurrentVersion\WinlogonNotify. Delete all references in your registry to WgaTray.exe, which can be found by using the search utility.
That should do it for you. Please note, make a backup first, before you break something!