Crash in Test Chamber

Every time I am in the test chamber, after I put the sample into the machine, it will go on as usual, but suddenly like clockwork the game will stop working.
I have the crash log, and yes I did check to see if the files were corrupt, and they aren’t all MD5 sums match every single file.

[code]Problem signature:
Problem Event Name:APPCRASH
Application Name:hl2.exe
Application Version:0.0.0.0
Application Timestamp:470c11ae
Fault Module Name:client.dll
Fault Module Version:0.0.0.0
Fault Module Timestamp:504ecc4f
Exception Code:c0000005
Exception Offset:00362edd
OS Version:6.1.7601.2.1.0.256.48
Locale ID:1033
Additional Information 1:0a9e
Additional Information 2:0a9e372d3b4ad19135b953a78882e789
Additional Information 3:0a9e
Additional Information 4:0a9e372d3b4ad19135b953a78882e789

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[/code]

Machine:

Windows 7 Professional
Intel i5 Ivy Core 4.2Ghz Quad Core
Nvidia 550Ti 1000Mhz
16GB RAM

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