Orange Box, can't play anything

[Bluekage]

Hey everyone,
I just bought the orange box today and after some initial problems with steam I've managed to get everything installed.

However whenever I try to play anything HL2, ep1, ep2, portal or TF2, I receive "hl2.exe has encountered a problem and must stop." And the following error signature

AppName: hl2.exe AppVer: 0.0.0.0 ModName: unknown
ModVer: 0.0.0.0 Offset: 00000000

Does anyone know what's wrong and how I can fix it?

 

[Nitre]

Try verifying cache files and reinstalling the games. Also provide computer specs for people who might be able to help better than i.