Issues, such as missing or corrupt textures, can occur if your video drivers are incorrectly installed or have become corrupt.
The follow instructions explain how to completely remove all existing driver files and are recommended for advanced computer users only.
These instructions recommend using a third party application called Driver Fusion. This application was not developed by Valve and we provide no support or guarantee regarding its use.
Please proceed at your own risk.
Remove your drivers
Click Start, then Run (or Windows Key + R) and type in the following command:
Locate and uninstall your video drivers (They should be listed under Nvidia or ATI alphabetically)
Tap the F8 key while your computer is booting up. A list should appear with Safe Mode as an option.
There will be checkboxes for "ATI - Display" and "NVIDIA - Display". Check both of these and click "Clean"
If you receive errors, please note exactly what they are.
It is recommended to repeat the cleaning process a few times to make sure all files are properly removed.
You may notice some graphical irregularities (Items being larger than usual, and etc). This is normal.
Run Driver Fusion one more time from normal mode to ensure that all driver files are removed.
Notebook drivers should be obtained from your notebook manufacturer