13 Apr 2006 at 16:52 - 7
Make sure that you set your system so that it isn't doesn't reboot when the error occurs.
Right Click "My Computer" > Properties > Advanced > Startup and Recovery > Uncheck "Automatically restart"
This way you will see a BSOD instead of your system rebooting.
It will indicate what your system thinks the problem is.
I say "thinks" because I have seen cases where the reported error wasn't actually what the problem was. But it is a good place to start.
Post the error message here verbatim and it will be easier to figure out what exactly is happening.
Also post your system specs ,.i.e. Ram, Video Card, CPU, etc…