If you are missing textures or other content in game or experiencing crashing while playing a game, you can have Steam verify that the game's files are installed correctly on the computer.
- Restart your computer and launch Steam
- Next, you can either right click the game in your Library, or click the gear icon from the game's Library page on the far right
- From the drop down menu, select Properties...
- Select the Local Files tab and click the Verify integrity of game files... button