How to run the Disk Defragmenter in Windows XP By Drew Mathers | August 20, 2015 1 1. Click: Start 2 2. Click: All Programs 3 3. Click: Accessories 4 4. Click: System Tools 5 5. Click: Disk Defragmenter 6 6. Select Drive C: 7 7. Click: [Defragment] Posted in Beginner