XP Product Key Mix-up, any help would be appreciated

[nbmeist]

I work at a small computer store and we were building a few PC's and the copies of Windows XP Home got mixed up before the stickers were put on the cases and I dont know which is which. Anyone know of a way to tell what product key was used to install Windows, through the registry or otherwise? Any help would be appreciated. Otherwise i think i'm screwed, thanks

 

[Bglad]

Just search the registry for the key number. If you don't get a hit try the next number until you get a match. Obviously you can remove that number from your search list of the next machine and your search gets easier each time you eliminate one.

I hope you are "a small computer store" and you only built a few machines. If you built 1000 this is gonna suck.