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I'd say the first place to start would be a System Restore.
Make sure you go back before the problem started.
System Restore
Run sfc /scannow. Run it 3 times, if it finds problems.
http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html
Update your Anit-Virus protection, then run a scan, fix anything it finds.
Download Malwarebytes, update, scan and fix anything it finds.
http://download.cnet.com/Malwarebyte...-10804572.html
Download CCleaner, keep running the registry cleaner until it doesn't find any more.
http://download.cnet.com/CCleaner/30...-10315544.html
You may want to wait on reinstalling the game until we make sure your computer is running better.
Afterwards, let me know how your computer is running.
Quickdraw