Thanks guys.....

Sorry I wasn't as forthcoming as I should have been with my specs....my friend put it together so I'm not sure about all the answers....it's 64 bit, Asus Sabertooth X58, and the graphics card (is that the same as a video card?) is Galaxy GeForce GTS 450....

 

And thd777, I bet you're right about changing from shader 4, but I do love the imoproved visuals so I might only change it when a certain scene because especially buggy....

Thanks again!