If you're experiencing visual glitches, make sure you have Antialiasing disabled in the game's settings application. Turning the Shadows to Low may also be required in some cases.
To make up for the disabled Antialiasing, you should be able to force it on via your graphics card's configuration utility without suffering from visual glitches.
For the NVidia Control Panel you can find it here:
Manage 3D Settings,
Set "Antialiasing - Mode" to "Override any application setting",
Set "Antialiasing - Setting" to anything other than "Application-controlled" (the higher the better, but the higher settings will affect performance).
For the Catalyst Control Center you can find the settings here:
3D -> Anti-aliasing,
Uncheck "Use application setting" and use the slider to set the amount of anti-aliasing to suit your needs and computer's performance.