Pretty strange, considering that you seem to have done the right things. I'll assume that the Nero verification confirmed a good burn, which would also confirm that you used a 700 meg CD and not a 650 meg cd. I really don't know what the problem is. It might help to know a bit about your hardware, particularly the type of disc drive you are booting off of (It's not a USB CD, is it?). The only other thing that I can suggest is boot the CD again and at the prompt type memtest to run memtest86. I really doubt that is going to find the problem, but it would be foolish to not be sure at this point.