Ok, ever since my alienware fried i've been having to play on this garbage dell. With terrible fps, so I searched and found this program for raising fps. It's a thing you do to your monitor.
http://www.pagehosting.co.uk/rf/Download it, run it, then when you get done restart your computer and see if it helped. It raised my fps from a constant 30-40 to 85. It's not exactly the 1000 fps I got with my old comp, but it's a hell of alot better.
Better get good karma for this.