Need help cleaning up my computer and optimizing performance

Hi, I’m looking for a friendly tech helper to clean up my computer and improve its performance. It’s an older Windows PC, and I’d like a thorough cleanup: remove unnecessary files, uninstall unused programs, run disk cleanup and defragmentation if needed, and optimize startup programs. Please also check for malware, update drivers, and tidy up the desktop. I don’t need hardware repair, just a software-side clean and speed boost. I’d prefer someone patient who can explain what they’re doing and provide simple maintenance tips for future use.