In the bottom right of the screen you should see the little battery icon. Right click on that and go to "Power Options." Set the power profile to highest performance (or whatever it's called :P)
If that doesn't work, what does task manager say your CPU load is at?
Also, you said you "should be able to run it," have you been able to run it at a higher frame-rate before?
well I can run skyrim, Cod Ghosts, Bad company 2, on high with 30-60 fps, and all the websites I checked say I should be able to run it