1. Disk Cleanup and Disk Defragmenter
2. Malware and Virus Scanner
3. PC Optimizers and System Tune-Up Utilities
4. Uninstalling Unused Software
5. Updating Drivers and Software
6. Adjusting Virtual Memory
7. Disabling Startup Programs
8. Editing Windows Registry Settings
9. Reducing Visual Effects
10. Disabling Unnecessary Services