Increase Available Disk Space

One of the improvements that Microsoft has improved upon over the other Windows releases are Vista's backup features that are incorporated in to System Restore. The backup features are turned on by default so with all of the automatic backing up Vista does, it won't take long to lose quite a bit of disk space. It may not be a bad idea to go in and delete the old backup files and restore points to increase your available disk space. Vista makes this task a very simple one. here's how:
1. Go to Start
2. In the Instant Search text box, type: disk cleanup
3. Open the disk cleanup tool and select the option titled: Files from all users on this computer
4. Select the drive that you would like to cleanup.
5. Select the "More Options" tab.
6. Click the option titled: Clean Up under System Restore and Shadow Copies
7. In the confirmation screen, click "Delete".