For first, the random restarts may comew from bad RAM. www.memtest86.com
<- This test will confirm it. Any errors and it's bad.
Second, it looks like the board isn't recognised by Windows XP. It happens on small occasions. So, I'll be following Atomic Rooster:
Okay, I've see now. The A7V series have issuing with Windows and Linux rejects it. It could be the board with IRQ problems...or it may be not recognised upon installation.