How to clean unwanted files: 1. From the Start Menu close All Programs 2. From All Programs choose Accessories 3. From Accessories choose System Tools 4. From System Tools choose Disk Cleanup After you clean up unwanted files you should defragment your hard drive. Here's how: 1. From the Start Menu close All Programs 2. From All Programs choose Accessories 3. From Accessories choose System Tools 4. From System Tools choose Disk Defragmenter. 5. Choose Defragment Now. You should always clean your unwanted files up first.