|Just to answer the question:|
If you have room on your hard drive, you can increase the hard drive space using a utility called Gparted.
You can download and burn gparted to a CD, and you can boot it into your computer and edit the partiton table there.
It is not reccomended if you do not know what you are doing, as you can damage your PC and loose your data if you perform a mistake (I have been there and done that!)
If you would like to find out more about disk partitoning, click here to find out more on disk partitoning and how to safely perform it