When you've finished your cleaning chores, put the cover back on the PC and take a moment to clean the monitor screen and the case. You'll find special cleaning materials for this at the computer store. Make sure, by the way, that you don't get any moisture inside the case while you're cleaning. Now you need to do some cleaning of the computer's hard disk. If you're like most people, you have dozens of programs on the disk that you no longer use.
Most modern programs have one.
Finally, after all the programs have been removed, you should run ScanDisk to check the hard disk for errors. This is also a good time to run the Disk Defragmenter. It wouldn't hurt to run these programs fairly often - perhaps at least once a month or more often if you think of it. This will keep the hard drive in tiptop shape and keep the computer performance from lagging due to excessive spinning of the hard drive. Don't place manuals or papers or diskettes on top of the monitor, and make sure there's at least 4 inches of clearance for cooling and ventilation around the computer itself.