It’s called disk defragmenter and in XP is something you should run manually every 2 -3 months. With Windows Vista this is usually scheduled to run automatically, but it is worth checking it every now and again. Use the Analyse button in Disk Defragmenter to see if it has been running.
Note : If you have a Solid State Hard drive (usually found in Netbooks) you should not run Disk Defragmenter In Windows XP, the easiest way to run Disk Defragmenter is to open My Computer, right click on the drive you want to defragment and then click on Properties, then Tools, Defragment Now.
Running this can take anywhere from 10 minutes to 2 hours. While you can continue to use your computer while this runs, it can be very slow, so it’s best to run a defragment when you won’t be using it. Take a coffee break.

Defragmenting, as well as speeding up your computer can also help prolong the life of your drive, now how is that for a reason to run it?
Other things that can slow down your PC are:
• Having too many programs open at once
• Not having enough RAM (memory)
• Malware, spyware and viruses
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