What are the best PC optimization tips for improving computer speed?

1. Run a virus scan.

2. Install the latest security updates.
3. Uninstall unused programs.
4. Delete temporary files.
5. Clean up your disk and partition your hard disk.
6. Disable startup programs.
7. Enable disk cleanup and defragmentation.
8. Clean the registry.
9. Adjust your visual effects.
10. Adjust your power settings.