I got problems.

I have a Prophet 3D ddr/dvi. I was TRYING to play QIII today, but it would freeze 3 minutes into the game or so. Its not overclocked, i am using 3.77 drivers, i was playing fine yesterday. I am, however, running WindowsME...Its rock solid, this is the first time it really crashed. I've been using it for close to 2 weeks now, robooting only twice. I tried rebooting several times, but the problem still happens.

Could this be an overheat problem?