I'm looking for someone to clean my computer and optimize its performance. The task includes physically cleaning the exterior and keyboard, removing dust from fans and vents, and performing a light software cleanup (uninstalling unused programs, clearing temporary files, and updating essential software). I prefer someone who can also advise on basic maintenance to prevent future slowdowns. Customer supports Windows 10/11 and wants the job done without downtime, with care taken to back up important data if needed. Please provide an estimated duration and any preparation needed before arrival.