Hey I've just flashed my evga 8800GT 512MB into a EVGA 9800GT 512MB SC because of the temperature of the evga 8800gt was not even cool to deal with.(hehe get it it wasn't... w/e) Besides that, the point is that when i play games such as TF2 it freezes at random points. I can't Alt + Tab but I can Ctrl + Alt + Del.(I have Windows 7 BTW) So since i have windows 7 it sends me to a menu that i can choose from. When i press cancel or Task Manger it sends me back to my desktop. But i see my TF2 still running. I click back onto it. It slowly comes back. Then it freezes again and then it starts artifacting then freezes the whole computer.