Defragmenter gathers files together and groups them to take advantage of that extra space. Follow these simple steps to perform a disk defrag in Windows XP.
- Click Start, All Programs, Accessories, System Tools, and then select Disk Defragmenter.
- Click on Defragment to start the process. (You can select Analyze first and that will show you the changes that will be made, but this is not necessary)

That’s all there is to it. This process will take a decent amount of time depending on how full your hard drive is, but you can run it in the background and go about your day while it is running.
