Microsoft releases a update today, so yeh: Run task manager and kill WgaTray.exe. Then, go to System32 folder and find WgaTray.exe and wgalogon.dll. Rename both files to something like WgaTray1.exe and wgalogon1.dll and do a restart. No more annoying messages from Microsoft If your XP isn't registered. Tested, and works as of right now.

Techzonez does not in any way endorse piracy, however if you are the victim of a fradulent license seller of XP and you are getting these annoying messages, this fix should take care of it long enough for you to get a legitimate copy of XP.