Back up and data protection:
Start any serious system maintenance with a full system backup. An up-to-date backup is good insurance against catastrophic events that might bring down a PC: such as power spikes, hard-drive crashes, malware infestations and the like. All current versions of Windows provide the means to make reliable backups, though each new generation of the OS has added enhancements to its archiving capabilities.
Wear and Tear
Traditional hard drives are possibly the hardest-working components in PCs. Their spinning platters can rack up hundreds of millions of rotations per year, and their read/write heads chatter back and forth millions of times, moving chunks of files. It’s a testament to hard-drive technology that they work as well, as long, and as reliably as they do. but surely all drives eventually wear out.
Take a few minutes to check your drive’s physical health. Every version of Windows from XP on has chkdsk (as in “check disk”) for exactly that purpose. The basic version of chkdsk is a simple point-and-click operation. In Windows Explorer, right-click the drive that you want to check and select Properties. Click the Tools tab and then, under Error-checking, click the Check now button
The command line–based chkdsk is more powerful than the one-click version in Properties.
Chkdsk’s command-line options vary significantly from Windows to Windows, but chkdsk c: /f works in all versions for basic error correction of the C: drive. (Change the drive letter to check and correct other drives.)
To see the version-specific chkdsk commands available in your copy of Windows, open an administrator-level command window (right-click Command Prompt and select Run as administrator). Type chkdsk /?and press Enter. You’ll see a complete list of all available chkdsk options.
Antivirus: Verify that your system is free of worms, viruses, Trojans, and other malware by running a full scan with a standalone security tool such as Symantec software. Make sure that your antivirus software is current and updating correctly.
Make sure your devices are behind a router and disable WPS:
Routers act as a shield and hide your computer from the internet. Plugging directly into your modem many times will not provide the needed protection that a router will provide.
Clean it out: Sometimes the air cans are good but I prefer my 3M Toner Vac to do PM cleanings on customer computers. It catches 99.9% of airborne particles instead of my lungs. If you plan to use an air can to clean out the computer the best advice I can give is to bring the computer or laptop outside to complete this task.