How to Use WinDirStat to Analyze Your Hard Disk Contents

One of the things you should do to figure out how your hard disk or network drive is organized is to make a list of all of the various file types on the disk and organize that list by file size. This gives you an instant view of what's taking up the most space on your disk.

http://sourceforge.net/projects/windirstat/files/windirstat/1.1.2%20installer%20re-release%20(more%20languages!)/windirstat1_1_2_setup.exe/download