Due to the nature of Windows, the harder you use your PC, the slower and more troublesome Windows tends to become. Especially as you install and uninstall programs and visit web sites -- things collect in your operating system that makes it less efficient and likely dangerous and insecure. You need some kind of software to keep your PC in tip-top shape. Norton Tuneup is a popular commercial product that performs these kinds of clean ups. The good news is Glary Utilities does a great job and is free. Glary Utilities provides all the cleanup functions for which you would normally pay. After downloading and installing Glary Utilities on your PC, you can perform a slew of fixes to your Windows computer. When you choose the Scan for Issues button on the 1-Click-Maintenance Tab, you can, all at once, run the Registration Cleaner -- the Windows Registry is  where Windows stores all of its important settings and a hotbed source of potential problems, the Shortcut Fixer (it finds and removes pointers to file that are no longer valid), the Startup Manger (looks for programs that your PC automatically runs at startup that may either not be necessary or actually sinister), the Temporary File Cleaner (your disk space is used up by unnecessary files that were created or downloaded for one-time use), the Tracks Eraser (for the paranoid, cleans up behind you, the trail of your internet surfing habits) and the Spyware Remover (dangerous files that you may pick up from websites that track your computer use habits and compromise your privacy). You can uncheck any of those fixes that you don't feel you need and then let it rip. When you're finished you have a more secure, more private and optimized computer. The fixes also can be used individually with more advanced settings. There is, a for-pay version -- of course, that for  $39.99  offers enhanced utilities, support and can be used commercially. Luckily, the free version has plenty of functionality for your home PC. Download Glary Utilities