released a fix that is suppose to fix the "Virtual address space usage in Windows game development".
This Vista hotfix is recommended for Geforce 6.7 and 8 series customers running DirectX 9 and 10 so basically most of Nvidias market. The hotfix will resolve abnormal application behaviour such as crashes and extremely low frame rates when running some 3D applications at very high graphic settings.
The issue is most commonly notices at Battlefield 2, Battlefield 2142, Civilization IV, Company of Heroes, Half-Life 2, Lord of the Rings: The Battle for Middle Earth II, Supreme Commander, Tom Clancy's Rainbow Six Vegas, and some highly anticipated upcoming titles.
Nvidia highly recommend getting this fix. Microsoft has the fix available at his site here
while Nvidia has its own link here