You may well find that a cheaper alternative is to find a PC mag with a cover disk containing such a utility.
Or search for same on the internet.
Do back up your important files before playing with partitions!
Without going down the partitioning route, you should be able to find more space on the C: drive by moving the swap file to D; moving the location of "documents and settings" from C (default) to D; searching for and deleting the .tmp and ~*.* files that have accumulated, and emptying the temp folders, then empty the recycling bin.
Oh yes - almost forgot - you may be able to compress some folders - I suggest "Program Files" as a minimum. Depends on what OS you have.
SD