Try all the steps outlined here:
!---IMPORTANT: Please Follow These Steps Before Posting---!
If they don't help, post back with your system specs according to this thread:
http://www.techsupportforum.com/558208-post1.html
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"Come forth for the cattle call
Confront the evil river you can't control
Wicked ways and venomous eyes
Just human nature in disguise..."- Clouds over California