Left 4 Dead crashing! NEED HELP!

[SMASH]

Left 4 Dead has been crashing lately for me and I don't know why. Here is the "problem signature":

Problem signature:
Problem Event Name: APPCRASH
Application Name: left4dead.exe
Application Version: 0.0.0.0
Application Timestamp: 492b66bb
Fault Module Name: client.dll
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 4ac29d64
Exception Code: c0000005
Exception Offset: 002cac93
OS Version: 6.1.7600.2.0.0.256.48
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

Bye the way I'm running Windows 7.

[SMASH]

So I lowered some of the video setting and I got this mother:

[Craig]

reinstall

[SMASH]

Already did, bro. Twice.

[Craig]

Hmm well the error your getting seems like its from a corruption of game files, or have you overclocked at all?, it happens with me if i push it too hard.

[SMASH]

No, I've never overclocked anything. I'm reinstalling it again from steam...we'll see.

[Craig]

Seems that the garbage can (which is usually spawned randomnly, is within or intersecting another object, which is usually a wall)

Im guessing that the crash appears in random games?