XP repair

Shitloads of blown mobo/CPUs after the last month’s hydro burps. Anyone know how to do an XP Repair that doesn’t require you to phone in to activate?
(yes you guessed 3/4 “lost” their XP sticker and CD)

More info :smile:  can you log into safe mode ? can you run regedit from dos and find the key ?

way easier to run keyfinder from a Bart disk. But it’s amazing how oftern the key is invalid…