To find out which files are using up the most hard drive space, run this in a cmd window:

dir /a:-d /s /o:-s /b > c:\temp\dir.txt

It will create a file called dir.txt in your c:\temp directory and will list all files on your PC in size order, starting with the biggest. Just let it run for a couple of seconds and you'll have a list of all the biggest files on your disk.

I miss using DOS properly