1. Install and run a reputable antivirus/anti-malware program. Be sure to keep it updated and run regular scans with it.
2. Install and run a registry cleaner program to remove junk and invalid entries from the registry.
3. Remove unwanted programs and files that you don’t need anymore.
4. Uninstall unused programs to free up disk space.
5. Perform disk defragmentation and set Windows Update to automatic so that you can get the latest security patches.
6. Use a system cleaner/optimizer program to help speed up your computer.
7. Make sure that you have the latest version of your installed software and drivers, as this will help improve performance.
8. Make sure that you have enough RAM, as having too little can cause performance bottlenecks.
9. Close any programs or services that are running in the background and not needed.
10. Limit the number of programs that automatically start when your computer boots up.