CS:GO and DotA2 crash on startup. Other source games are fine.

[ashxu]

For some reason I now can't play CS:GO or DotA2. When I try to open them, it says I'm playing them for 3 seconds but nothing comes up.

CS:S and Garry's Mod both work fine though, along with all other non-source games. I tried looking it up but I couldn't find anything useful.

Here are my PC specs:
[img]http://imgkk.com/i/ei2a.jpg[/img]
I also updated my drivers recently if that matters.

[Killervalon]

Try updating drivers and verifying game

[ashxu]

I updated my drivers yesterday. As for verifying, I verified cache for both games and both did fresh installs and still nothing.