I had a similar problem. I have the ge force 6800 GT. After installing the 1.2 patch, I also updated to the 158 nvidia driver (there is a vista version, 32 & 64 bit)....Very bad frame rates, and even worse, the audio was really screwed up. I rolled back to the original driver and the problem still existed. I was pretty frustrated at this point, so I uninstalled the game, installed the new driver, reinstalled the game, then the patch and viola....problem fixed. Therefore, I would suggest a reinstallation. BTW, uninstall your current driver before updating the driver. The directions say you will be prompted for the uninstallation, but my first try was not successful and after removing the driver first (using add remove programs in control panel) I had better results. Hope this helps.
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