If you have a floppy, search for all files on the system with file extension .WPA and copy them (preferably with their directory paths) to the floppy disk. After you have re-formatted and re-loaded XP, copy those back where they came from and you may be able to dodge re-activation. Loading your virus killer and checking the floppy is also good, enable your antivirus apps if possible before using the content of anything burned while you have an infection.