My apologies for the false accusation. Unfortunately, you're one of a very small minority who has problems with a legitimate key. First off, make sure your winnt.sif says ProductKey instead of ProductID, as that changed from SP1 to SP2 (I might have flipped those around, I don't define the CD key in my answer file, so I'm not sure). Otherwise, do what Alanoll said and call MS about it. If your keys are legitimate, they should be able to help you. Again, apologies for accusing you. Understand that it was nothing personal, just that 95% of the time it is a pirated key and troubleshooting it is a big pain in the arse