Left 4 dead 2 unrecognized video card stackhash


I'm trying to install Left 4 Dead 2 on my Sony Vaio VPCCW2S1E laptop with Windows 7 OS which I recently bought but when I try to play the game it keeps telling me "left4dead2.exe has stopped working". The ful problem details are as follows:

Problem signature:
Problem Event Name: APPCRASH
Application Name: left4dead2.exe
Application Version:
Application Timestamp: 4bcfba0e
Fault Module Name: StackHash_b4ee
Fault Module Version:
Fault Module Timestamp: 00000000
Exception Code: c0000005
Exception Offset: 715d0000
OS Version: 6.1.7600.
Locale ID: 2057
Additional Information 1: b4ee
Additional Information 2: b4ee5de6a2322745523997a782b35692
Additional Information 3: 277e
Additional Information 4: 277e19c30fbd5f6bb531ec9e027c37c3

When I try and run through through Steam it also mentions that there is an "unrecognized video card" (an NVIDIA GeForce GT 330M) and asks me to upload the driver details to their technical "support" team (no response when I emailed them). When I read reviews about the laptop beforehand they said it was perfectly capable of running Left 4 Dead. I've uninstalled and reinstalled both Steam and the game twice now but it's always the same outcome.

Any ideas? Any help or advice at all is much appreciated, I'm going nuts here!
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