Do you have anything on your desktop. Like folders or anything, not shortcuts I mean actual Direct items. If so try moving them into my documents or something, because your computer can run slow if you have too many files on your desktop that arn't shortcuts. Because the computer is trying to load all those files as quick as it can and using up alot of it's capable power to load these items because you constantly see your desktop. If you want certain files on the desktop use shortcuts as this cuts down the amount of ram used by the computer.