Having a hard drive that is running out of space is frustrating when you do not understand how your drive filled up to begin with. There is a neat utility that is effective at showing where all the space has gone. It is FREE and called WinDirStat. Click the green button to the right to begin the download process.
Windows Directory Statistics will display a screen showing folders and their sizes. You can open each folder, if you need to, and view the file sizes as well. This tool is very helpful in determining what is taking up so much space and will allow you to understand what can be moved to another drive without affecting your system performance.