Team Fortress 2

[Jason1]

Okay I got you guys invites. Anyways, I would be playing this game, but for some reason right now I cant play any steam game, they all immediatley crash with this error upon launching...

Problem signature:
Problem Event Name: APPCRASH
Application Name: hl2.exe
Application Version: 0.0.0.0
Application Timestamp: 46ccbf79
Fault Module Name: shaderapidx9.dll
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 46eac7f4
Exception Code: c0000005
Exception Offset: 00029816
OS Version: 6.0.6000.2.0.0.768.3
Locale ID: 1033
Additional Information 1: f708
Additional Information 2: 2d645f9807c58f9e6bcea951e3ac2c9c
Additional Information 3: 9f8c
Additional Information 4: 984133996adf5c791b56cc8e5d498863

If anyone who knows a lot can make any sense of that let me know how to fix it.