Team Fortress 2 won't work

[Shikers]

Hey forums, I just recovered my computer from a virus and reinstalled Norton 360 and Steam. I just finished reinstalling Team Fortress 2, but when I launch it, it appears in a very small window and after the Valve and Steam screen pass, it disappears.
EDIT: It happens with every game, even the non steam ones!
Help?

 

[ksampanna]

Which OS do you run?
Maybe you need to fresh install the latest graphic drivers (only after completely removing the older ones).

 

[Shikers]

I'm unsure, but a friend installed a new supposedly better one into my computer. He still won't tell me what it is, but I know it was a really good one, because after it was installed all of my games worked.

 

[Mousemonkey]

This topic has been closed by Mousemonkey