Sure that would help.
Sorry to keep asking this but have you installed the latest Nvidia drivers, from the website? The way you have worded it suggests you installed the drivers off the discs provided.
Yeah I've downloaded the latest drivers from the website, re-installed them twice.
Here's the result of running dxdiag.
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System Information
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Time of this report: 9/16/2011, 23:13:23
Machine name: KREVIL-PC
Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.110622-1506)
Language: English (Regional Setting: English)
System Manufacturer: To Be Filled By O.E.M.
System Model: To Be Filled By O.E.M.
BIOS: BIOS Date: 10/28/10 10:56:08 Ver: 08.00.16
Processor: Intel(R) Xeon(R) CPU X5650 @ 2.67GHz (24 CPUs), ~2.7GHz
Memory: 12288MB RAM
Available OS Memory: 12280MB RAM
Page File: 2696MB used, 21859MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode
There's more but since I don't know how to work on this forum I cut off everything but the main part.
I can also tell you I went through a good half hour game of Black Ops on highest settings without a problem so at a guess I would say it's most probably a software problem rather than a hardware one, though I'm by no means anywhere near your level of knowledge on this.