Originally posted by Michael_Russell:
Are you using any odd graphics settings or command line flags?
No, fairly fresh installation of Windows, no overclocking, custom settings or command line flags.
Also, the drivers you are running look slightly newer than the 84.21 drivers available on nVIDIA's site. Have you considered rolling back to those?
These drivers are the correct drivers for Windows XP x64
You may have been looking at the regular Windows drivers.
As I'd indicated above, I have already tried rolling back to older drivers
. Every Valve source game is running correctly.