OK I've got 3.45Gb free on C drive now. The problem is that most of the useage is either in Documents and Settings 3Gb, Program Files 7Gb or WINDOWS 11.5GB folders. I've looked through Docs and Settings and most of that seems like system related stuff (to my untrained eye). Apart from the above the only other large enough thing is a 1.6Gb pagefile.sys. So I don't know what else to take off.
If you are OK with this then I'll start the defrag.
Nexar