Depends on what resolution you're gonna be playing at, but i would say your computer will be able to handle Skyrim on medium settings at 1600x900 resolution
Well i play Skyrim at 1920x1080 with a GTS 450 on high settings with 40fps+ so i should say with the GPU you have now you will be able to play on high at that resolution though i'm just speculating here also my cpu and ram is not as powerful as yours i think if you have the cash upgrading your video card would probs be a good idea, something like a Nvidia 560 Ti or a ATI HD 5850