BSOD when playing MW2, BF3 etc.

Yes it is best to update your Nvidia drivers from Nvidia.

Before you start updating I suggest you create a Restore Point:

Create System Restore Point

Just install the important updates for now, and that should be fine.

Thanks for the info.

I will post up my analysis in a short while.

Okay like I said previous, you need to install a genuine copy of Win 7 or I cannot help.

Its an ASUS key with a MSI retail board = non genuine.
A lot of issues/update issues/BSOD's can occur with a non-genuine copy, so it is best to use genuine media.

Have you not got a COA on the side/bottom of the machine you can use to activate Win 7?