I installed XP on this person's computer about two and a half years ago, and didn't have a problem. Granted, back then I used their legitimate XP Home with SP2 disc that they had (which they have since lost), but it was the same CD key and worked without a problem.
I am getting this "not valid" message while trying to enter the key during installation, NOT while trying to activate after installation.
I'd appreicate some advice.
Edited by diggeryo, 09 June 2009 - 09:35 AM.