OK axeman - you got my interest. I'm upgrading to a new P4 with hyperthreading, etc. Question is, has anyone ever done a heart transplant on Windows XP and lived to tell about it? I don't want to install everything from scratch. What if I replaced the mobo and RAM, then booted up. I'll probably get BSOD'ed right away, then I figure I'd attempt a repair through the recovery console. Will that work, has anyone tried it or am I just putting off the inevitable - having to install XP from scratch along with everything else.