My situation is a client that had a Compaq system with WinXP Home installed. The motherboard went bad & I transplanted their harddrive, etc. into a new box (same processor/differnet motherboard). Hoping that starting up from any XP Home CD would redo the drivers, I borrowed a friend's 'upgrade' CD.
But XP installed the Upgrade & required that serial number. Since I can't use it, & it won't accept the original serial number, is there a way to 'undo' this installation? The client is going to buy a new copy of XP.