Hello mad_dog_kurt,
Can you please make sure that you have the most up to date video card drivers. Here are links to some pretty common video cards:
AMD- http://support.amd.com/en-us
NVIDIA- http://www.nvidia.com/Download/index.aspx?lang=en-us
Radeon- http://support.amd.com/en-us/download
For more troubleshooting steps you can try, please see: Activision Support
Also, you might want to try verifying the game cache through the steam console. For more information on how to do this check out:
https://support.steampowered.com/kb_article.php?ref=2037-QEUH-3335
Thanks,
^JG
ATVI Support