Hello all Just discovered this really useful website ...and have spent the last few hours making a slipstreamed XP SP2 CD. Managed to get everything working the way I wanted for an unattended install using Virtual PC to check everything is in order, however during the install process, it tells me my product key isnt valid ...what could be causing this. The original CD has no such problems. Just to note ... just managed to make a slipstreamed SP2 CD (without much modification) which accepts the key perfectly?? so must be something to do with either programs I'm excluding in the modified version or else my winnt.sif file?? Any help appreciated