It keeps doing it. I am working on it for a friend, he doesn't know anything about it. I cannot boot from a CD either, I have changed it in the BIOS, and hit F8 to go to the boot menu, checked CD and it still didn't work. I don't see any errors, it shows a blue screen for less than a second, then it shuts down. I cannot reinstall the OS, I have read that it is a virus causing that, and I cannot get into Windows to get rid of it. None of the safe modes work, I go to them and it starts loading and then reboots. Last known good config doesn't work either, same result.
To boot from the CD, since you've changed the boot order, don't tap F8 on startup. You simply need to wait for the message to 'press any key...'
If you decide not to boot off the CD, and tap F8 to get into the advanced boot menu, arrow down and select disable automatic restart on system failure. Then you'll be able to read the BSOD the next time it happens.
A common reason for this, is faulty RAM. Try using 1 RAM chip at a time.