Thanks to everyone for all the great info on these boards. Suddenly out of the blue the other day I got the dreaded message telling me I had 6 days to activate. I'm not sure what happened. Anyway, I'm running XP Professional from a retail CD on a self-built computer with an Asus motherboard. I followed the instructions (or so I thought) in the Windows XP Repository but it's still not showing as activated. My CRC value is HITACHI BE5CE5BD. I downloaded the 4 OEMBIOS files and put them in the uncompressed folder and the Changer Tool appeared to work without error. I'm wondering if I still need to go in an change my product key, since the key I'm currently using is probably retail. Or perhaps there's something else I missed somewhere along the way? I did use Hazar's XP Activator tool about a year ago, so I'm wondering if that's what is interfering? Thanks in advance guys!