[Blix]

I just downloaded it today. I'm going to give it a try tomorrow... after I give a try to the Guild Wars 2 stress test.

And Angrist, you were playing Portal 2 fine with me. That game is newer than TF2. Also... you might want to check your power supply. My computer used to restart itself when playing games until the PSU gave in and that's how I found that was the problem. Broken pins inside the monitor or gpu can also cause problems that can be hard to figure out. Update your drivers in case some games may cause problems with them. If it's none of that, then you should check out the rest of the computer.