How to free up space in the local disk (C:) drive?

My local disc (C:) drive normally has 33 gb of space, but right now it has only 1 gig of free space left. Also I am getting constant interference with my internet connection, difficulty connecting. I believe it may have something to do with the lack of space. What's the fastest easiest way to solve this... show more My local disc (C:) drive normally has 33 gb of space, but right now it has only 1 gig of free space left. Also I am getting constant interference with my internet connection, difficulty connecting. I believe it may have something to do with the lack of space. What's the fastest easiest way to solve this problem? What's the fastest easiest free of charge way to free up my space? If there are certain steps that should be taken please number them in sequential order. My OS is Windows XP. My PC which is by now approximately 6 years old is a T43 IBM ThinkPad laptop centrino.
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