XP activation Loop

[Guest]

I loaded XP professional on a PC and I received a message that it had
activated fine.
The PC was not used for several weeks maybe a month and now when you turn it
on you get a continuos loop, telling you XP needs to be activated. You click
activate and get a message stating Windows is already activated click OK.
Click OK You get the same message as before stating Windows needs to be
activated.

Help!
Any ideas other than re-formatting and starting over.

 

[Jupiter Jones [MVP]]

Robin;
Reboot to Safe Mode:
Reboot tapping F8 each second.
Select Safe Mode at the menu

Start/Run
Type "regsvr32.exe regwizc.dll" ENTER
Type "regsvr32.exe licdll.dll" ENTER

Reboot.
Activate again
Reboot