Thank you for the answers. I don't know much about the CCC because I have never use a AMD card. In the nVidia controll panel it is called manage 3D settings in there I can disable or turn on stuff.
I guess I thought the CCC would have one very close to that. Have you tried to do the Verify Integrity of game Cache? I will post a note if you don't know how it is done. Ok we can rule out temps.
We can rule out the OS and MOBO. Drivers still could be a problem. Still need to see he Steam integrity and your PSU I hate to say but it is not that good but don't feel bad mine is even worse.
There is a list of good to bad PSU's Tier 1 is the best Tier 5 is the worst and your PSU is on Tier 5 I will link you to it. But that does mean your PSU is at fault. I mean if you are doing a lot of stuff on it.
Then it should be ok. So just about everything can be ruled out except.
Drivers, Steam Integrity, and one more thing when you uninstall a game a lot of times files are left still in the system.
And if there is a problem with the game uninstalling then reinstalling the game still migh not fix it. So I am going to link you to revo uninstaller program. I had to use it on my Age of Empires III because I was having problems.
Here we go with everything and I hope some of this will help and good luck.
PSU good to bad
http://www.eggxpert.com/forums/thread/323050.aspx
NOTE: When in Steam, left click on Games. Then left click on view Games Library. Right click on the Game. Then left click on properties. Then left click on local files. Then left click on Verify Integrity of Game Cache.
http://download.cnet.com/Revo-Uninstaller/3000-2096_4-10687648.html
Here are two programs to help run your games.
http://gboost.en.softonic.com/
http://www.iobit.com/gamebooster.html