Hi suicidezerker!
Please check your video-card driver first. Get sure that you have installed the latest version of your driver. Go to your Options menu under graphic quality: "custom settings". You should now be able to access to the "custom render settings" menu. Please disable all graphic enhancements in this menu.
Go to your custom settings of your video-card software. Disable all extra options for enhanced graphics and set the preferences for AA and anisotropic to “use application settings”.
Launch the game, if the issue is solved, you can try to set the graphic options higher.
Please keep us updated. Accept as solutions if the issue is solved or let us know if not. Our community may find other possible workarounds.
Cheers
Basti