Disk Cleanup
Wow, I freed up about 11 GB's on my Hard Drive using disk cleanup.
For XP users do this.
In your Start menu, click My Computer.
In the My Computer dialog box, right-click on the drive you wish to check for errors (for most of us this will be the C: drive, unless you have multiple drives on your computer), and click Properties.
In the Properties dialog box, click Disk Cleanup.
For Vista users go to the start menu, go to all programs, go to accesories, go to system tools, then disk cleanup. Check all the files. Clean






