hsDefragSaver for Windows

The description of hsDefragSaver - Play With New Friends

Increase performance by defragmenting your hard-drive. hsDefragSaver allows automated defragmentation of one or more drives. A fragmentation threshold is used to determine when to defragment. hsDefragSaver runs as a screen-saver while your computer is idle and you are away. A customizable, built-in screen-saver is included, but your favorite screen-saver can also be used in the foreground while your hard-drive is maintained in the background.