Ok, I should have about 2.6gb left on the hard drive that windows is installed on, but I woke up this morning to find out there are 0 bytes left. My swap file is on the other hard drive so that's not the problem.
I've checked the amount of space that \windows, \program files, and the documents and settings folder are using and there seems to be nothing out of the ordinary. I haven't downloaded anything either, so I have no idea what's eating my space.
Any ideas?
Edit: BAH nevermind.... I found the problem... I hadn't set up security on my SMTP server properly and it was being used as an open relay... and now I have several GB of e-mails - I can't even view the data folder coz there's too many of the fuckers