I'm looking for a tech-savvy person to perform a thorough cleanup of my desktop computer. The job includes dusting internal components, removing temporary files, optimizing startup programs, updating software, and running performance diagnostics. I’d prefer someone who can explain the steps in simple terms and provide a brief report on what was cleaned and any recommended upgrades. The computer is a mid-range Windows PC, about 4 years old, currently running slowly and occasionally freezing. Please bring necessary tools, and let me know if you recommend additional maintenance or replacement parts.