The first few times I tried installing Windows 7 x64 RC, I was able to get it installed but on the first reboot I would get a BSOD. I didn't bother writing down the error codes, just kept trying. Finally gave up on x64 and was able to install x86 with no problems what so ever. I then swapped hdds and was able to install Vista Ultimate x64 also with no problems what so ever. I have that hdd in now. My last 3 attempts after re-downloading and re-burning ended with the same results of the OP.