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Do You Really Need to Regularly Reinstall Windows?

For many people, Windows seems to slow down over time. Quite a few people fix this by regularly reinstalling Windows. But do you need to reinstall Windows regularly? And, if so, how often do you need to reinstall it?

Reinstalling Windows is inconvenient. You have to back up all your data, go through the install process, reinstall all your favorite programs, and restore your data. All these activities suck up valuable time.

Why Windows Slows Down Over Time

The main reason people reinstall Windows is that it slows down over time. But why do Windows systems slow down over time?

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In other words, the leading cause of a Windows system slowing down over time is installing junk software.

How To Prevent Windows From Slowing Down Over Time

To keep your Windows system running like new, you need to take proper care of it.

Tips for Testing Software

If you want to test software without letting it mess up your system, consider installing it in a virtual machine or using a sandboxing tool like Sandboxie to isolate it from the rest of your system. The software won’t be able to mess with your primary operating system—just your virtual machine or sandbox environment.

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So When Do I Need to Reinstall Windows?

If you’re taking proper care of Windows, you shouldn’t need to reinstall it regularly. There’s one exception, however: You should reinstall Windows when upgrading to a new version of Windows. Skip the upgrade install and go straight for a clean install, which will work better. Performing an upgrade install can result in a variety of issues—it’s better to start with a clean slate.

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If your Windows system has slowed down and isn’t speeding up no matter how many programs you uninstall, you should consider reinstalling Windows. Reinstalling Windows may often be a faster way to get rid of malware and fix other system issues than actually troubleshooting and repairing the specific problem. However, you should try to take better care of Windows in the future.

If your Windows computer is running fine, you don’t need to spend hours reinstalling your operating system—even if it’s been years since you last reinstalled Windows. That’s a sign you’re doing an excellent job of taking care of your Windows system.

How To Quickly Reinstall Windows

If you are going to reinstall Windows, Windows 10 makes this much more manageable. Windows 10’s “Refresh Your PC” feature effectively performs a quick reinstall of Windows, removing all your installed desktop programs and any other system modifications, while preserving your personal files. You don’t even need a Windows disc to do this.

If you’re using a previous version of Windows, you can reinstall Windows from a Windows installation disc or restore it from your computer’s recovery partition. Before you reinstall Windows from the disc or recovery partition, make sure you have backups of all your important files. Read our guide to reinstalling Windows for more information.


There are other reasons to reinstall Windows. Maybe you like that clean, “like new” Windows environment. However, if you carefully select the software you install and take proper care of your Windows system, you shouldn’t have to reinstall Windows regularly.

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Sure, file system fragmentation can cause Windows to slow down over time as well—but Windows automatically defragments your hard drive and defragmentation isn’t even necessary on SSDs.

Chris Hoffman
Chris Hoffman is Editor-in-Chief of How-To Geek. He's written about technology for over a decade and was a PCWorld columnist for two years. Chris has written for The New York Times and Reader's Digest, been interviewed as a technology expert on TV stations like Miami's NBC 6, and had his work covered by news outlets like the BBC. Since 2011, Chris has written over 2,000 articles that have been read more than one billion times---and that's just here at How-To Geek. Read Full Bio »