To temporarily stop Disk Defragmenter so you can run other programs faster, click ' Pause '. During defragmentation, Disk Defragmenter must restart each time other programs write to the disk. If Disk Defragmenter restarts too often, you may want to close other programs while defragmenting your disk. This should remove dirty finger marks, dust, or pencil marks. Similarly, clean the screen by wiping with a damp cloth which has a small amount of detergent or soap on it.
Excessive liquid can damage any computer component.
Dust your keyboard regularly. The mouse, after several months of use, can become irregular in its movements. Place your fingers on the circular retaining disc in the centre of the mouse base, and rotate it anti-clockwise. Tip the mouse back up the right way. This should cause the retaining disc to fall off, along with the ball inside the mouse.