As you use your computer, and constantly save, delete and move files around, they can often become fragmented on your hard disc, leading to slower access.
In this screencast, we show you how to use the Disc Defragmenter in Windows XP, to clean up your hard discs, and group fragmented files to make access to them much quicker.
You should look to defragment you computer's hard drives every 2 - 3 months.