All across America, in offices large and small, people start watching the clock at about 2:00pm on Fridays. Time seems to slow down as the weekend beckons. But Friday afternoons are a great time to do a few Windows-related clean-up tasks every week.
Delete temporary files: Temporary files tend to proliferate, for a variety of reasons, and do nothing but occupy space. Locate them, delete them, and then empty the Recycle Bin.
Make backups: If you don't already do it daily, make backups of your data. Folks, this is cheap insurance. It isn't a matter of whether you need your backups, but when you need them because you will need them — so make backups! After you make the backups, store them somewhere safe.
Clean out the root directory: The root directory is a special place on each hard drive; it represents prime real estate in the file-storage world. (The root directory for the C: drive is C:\.) Unfortunately, root directories also have a tendency to become cluttered easily. If you take a look at them once a week and clean them out as necessary; it helps keep your operating system happier. You probably don't want to delete files willy nilly, but the only folders that should be in the root directory are those that represent major data divisions, move folders of lesser importance elsewhere.