Software & Apps > Windows How to Clean Install Windows (Delete & Reinstall) Install or reinstall Windows 11, 10, 8, 7, Vista, or XP from scratch By Tim Fisher Tim Fisher Facebook Twitter Senior Vice President & Group General Manager, Tech & Sustainability Emporia State University Tim Fisher has more than 30 years' of professional technology experience. He's been writing about tech for more than two decades and serves as the VP and General Manager of Lifewire. lifewire's editorial guidelines Updated on June 22, 2022 Reviewed by Christine Baker Reviewed by Christine Baker Christine Baker is a marketing consultant with experience working for a variety of clients. Her expertise includes social media, web development, and graphic design. lifewire's editorial guidelines Tweet Share Email Tweet Share Email Windows The Ultimate Laptop Buying Guide What to Know During a clean install of Windows—a last-ditch troubleshooting process—all the data on the computer's hard drive is erased.For Windows 11 & 10 users, the Reset This PC process is recommended over a clean install.For Windows 8, 7, Vista, and XP, a clean install is recommended for troubleshooting serious problems. This article covers how to clean install Windows in an attempt to address serious problems with your computer. It includes information on how to prepare to reinstall your files on the computer after the clean install is complete. When a Clean Install Is Recommended A clean install of Windows is the right way to go when all other software troubleshooting you've tried has been unsuccessful and you want to install or reinstall a clean copy of Windows back on your computer. Most of the time, you try a clean install after one of Windows' automatic repair processes hasn't solved your problem. A clean install returns your computer to pretty much the same state it was in the first day you turned it on. In case it's not clear yet, this should be reserved for the most serious of Windows operating system problems, since all the data on your primary hard drive partition (usually the C drive) is erased during the process. Lifewire / Brianna Gilmartin How to Clean Install Windows A clean install of Windows is accomplished during the Windows setup process by removing the existing Windows installation (assuming there is one) before installing a new operating system or reinstalling the existing one. In Windows 11 and Windows 10, the Reset This PC process is an easier-to-do, and equally effective, way to clean reinstall Windows. See How to Reset Your PC for a walkthrough. The individual steps involved in completing a clean install can differ greatly based on the operating system you happen to be using: How to Clean Install Windows 11 How to Clean Install Windows 10 How to Clean Install Windows 8 How to Clean Install Windows 7 How to Clean Install Windows Vista How to Clean Install Windows XP How to see which Windows version is currently installed Important Reminders Remember, a clean install will erase everything from the drive that Windows is installed on. When we say everything, we mean everything. You'll need to back up anything you want to save before you begin this process! You can back up your files online or use an offline backup tool. In addition to backing up the individual files you want to keep, you should also prepare to reinstall your programs. Gather the original installation discs and downloaded program setups to any program you want to put back on your computer. In most cases, particularly with modern software programs that are still accessible online through digital downloads, knowing which programs you want to reinstall is enough (no real backup is necessary) because you can just re-download them from the software maker's website. One easy way to document all your installed programs is with the Save to text file option in CCleaner, accessible via Tools > Uninstall. CCleaner list of programs. No program outside of those that come bundled with an original Windows setup will be on your computer after the clean install is complete. If you only have a restore disc from your computer manufacturer but not an original Windows Setup disc or download, a clean install as described in the linked guides above may not be possible. Your restore disc might instead have a relatively similar process that will restore your entire PC, Windows, and programs, back to the factory default. Please reference the documentation that came with your computer, or contact your computer manufacturer directly for directions. Was this page helpful? Thanks for letting us know! Get the Latest Tech News Delivered Every Day Email Address Sign up There was an error. Please try again. You're in! Thanks for signing up. There was an error. Please try again. Thank you for signing up! Tell us why! Other Not enough details Hard to understand Submit