If ScanDisk or Defragment starts over and over again and never finishes or even starts work, a program is running and interfering with them.

The remedy:

• If you have Windows 95, move all items out of your StartUp menu into another folder and stop your Screen Saver from activating.
• Reboot.
• Run Defrag or ScanDisk.
• Move the StartUp items back to the Startup folder.
• Reboot
• If you have Windows 98, Millennium Edition, XP
• First, stop your Screen Saver from running
• Then, go to Start/Run
• In Run's "Open" Box, type "msconfig" without the quotes and press Enter key
• When the System Configuration Utility Opens look for the StartUp Selection section.
• Click on the line reading "Load Startup group items" to remove the check from the box.
• Click on Apply.
• If you have a screen saver running, stop it from doing so by right-clicking on any blank area on the Desktop and then choosing "Properties" from the pop-up menu. In the Properties dialog box, click on the "Screen Saver" tab. In the Screen Saver dialog box, click on the arrow on the right of the box under the Screen Saver section. Choose "None." OK your way out.
• Reboot.
• Run Defrag or ScanDisk
• Go back to System Configuration Utility and restore the checkmark to the "Load Startup group items" box by clicking on the line.
• Reboot.