I was just viewing some topics on Reddit's Skyrim page and I bumped into this --
http://www.reddit.com/r/skyrim/comments/manrs/pc_make_sure_you_disable_thexbox_360_controller/
It just states that you may get better fps by unchecking the "360 controller" box from the Settings -> Gameplay section, within the game.
It looks like it has helped a lot of people who are suffering from low fps.
