Reinstalling Windows is an important strategy for any geek, and a useful skill for anybody who doesn't want to pay one. By starting over with a clean copy of the operating system, you can remove bloatware, wipe out malware, and fix other system problems.
A full, clean reinstall is different from the Refresh or Reset your PC options in Windows 8, or a manufacturer's recovery partition or disk for Windows 7. Those built-in options will set your PC back to its factory-default state--which could include some vendor-installed junk you never wanted anyway. A clean install uses the generic Windows installation media that you can download from Microsoft, and it'll have just the OS, no other frills.
You shouldn't need to regularly reinstall Windows to keep it performing well. But, if a computer is bogged down by startup programs, context menu items, and years of junk, reinstalling Windows may be the quickest way to speed it up again.
Before we begin, back up all of your personal data. While you should back up your data regularly, it is especially important to do so before reinstalling an operating system.
Refresh or Reset Your PC (Windows 8 and newer)
Windows 8 includes "Refresh your PC" and "Reset your PC" features that attempt to make installing Windows easier. Both of these options actually perform a Windows reinstall in the background, quickly installing a fresh Windows system from the recovery files on your computer's drive, a Windows installation disc or USB drive.
The Refresh your PC feature saves your personal files and Windows Store apps, but it removes all your installed desktop programs. You'll have to install all your desktop programs again, but that's the point: You get a fresh Windows desktop system with all your system files in a known-good state.
The Reset your PC feature wipes everything, including your personal files. It can even wipe your system drive so no one can recover those personal files later. This is the easiest way to remove your stuff from a PC before getting rid of it.
Both of these options are available in the modern PC settings app under Update and recovery > Recovery. If your computer isn't booting properly, it will boot to the advanced startup options menu, where you can select Troubleshoot to refresh or reset your PC. You can also access these options by booting from a Windows recovery drive.
Use your manufacturer's recovery partition or discs (Windows 7 or earlier)
In Windows 7 and previous versions of Windows, it's up to the PC manufacturer to provide a recovery partition or recovery discs. Most manufacturers don't include Windows installation discs with their computers.
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