You're probably restarting do to an automatic feature in windows when it detects a problem.
During the reboot press F8 like you would to startup in safemode. One of the options ont he 'safemode' screen, towards the bottom, is to disable automatic restart on system failure. - select it.
Now when your computer crashes you will get an error screen instead of a reboot. Write down or take a pic of it so you can come back and post the info here for us.