Yes, I know my username is the 330th sequel to a terrible movie. You don't have to keep telling me.
I was just playing some TF2 when my textures started glitching out, most textures started appearing as transparent triangles. All my drivers are up-to-date so don't tell me to update 'em. Anyone know how to help? And it's not just TF2 that it's bugging out with either, it happens to some 3D models, as well.
Specs:
AMD Phenom II X2 550 Processor (dual core)
4GB RAM
ATI Radeon 2600 PRO
If you need to know anything else, let me know.