This tutorial will show you how to defragment your hard drive in Windows XP.  This in only a minor tweak.

Disk Defragmenter rearranges the data on your hard disk to improve read and write performance.

How do I run a Disk Defragmentation?

Classic Theme:

1.  Click Start
2.  Select Programs » Accessories » System Tools
3.  Then click Disk Defragmenter.

Luna Theme:

1.  Click Start
2.  Select All Programs » Accessories » System Tools
3.  Then click Disk Defragmenter.

Then select the drive you wish to defragment (Most people will just have 1 drive).

1.  Click Defragment.

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