What a Master Reset Does and When to Use It

A master reset, also called a factory reset, erases everything on your computer and reinstalls the original operating system. All your files, programs, settings, and accounts are deleted. When you turn the computer back on, it looks and behaves exactly as it did the day it left the factory.

You would do this when your computer has become too slow to use, is infected with malware that won't go away, or you are selling or giving it away and want to erase your personal data. A master reset is also the last step when troubleshooting fails—when restarting, updating drivers, or removing programs has not fixed the problem.

Before you start, understand that this action cannot be undone. Back up any files you want to keep to an external hard drive, cloud storage, or USB drive. Write down any program license keys or passwords you will need later. This process takes 30 minutes to two hours depending on your computer's speed.

Key Takeaways

  • Back up all your files to an external drive or cloud storage before starting, because a master reset deletes everything on your computer.
  • On Windows, use Settings > System > Recovery > Reset this PC; on Mac, use System Settings > General > Transfer or Reset.
  • Choose whether to keep your Windows login account or remove it entirely—keeping it is faster if you plan to use the same account afterward.
  • The reset process takes 30 minutes to two hours and requires your computer to restart multiple times; do not turn it off during this time.
  • After the reset completes, you will need to reinstall programs, sign back into accounts, and restore files from your backup.

How to Master Reset a Windows Computer

On Windows 10 or 11, open Settings by pressing the Windows key and typing "Settings," then pressing Enter. Click System in the left menu, then scroll down and click Recovery. Under Reset this PC, click the Reset PC button.

A window will ask whether you want to keep your files or remove everything. If you choose Keep my files, Windows erases all programs and settings but preserves your Documents, Pictures, Downloads, and Desktop folders. If you choose Remove everything, Windows deletes all files and programs. For a true master reset, choose Remove everything.

Next, Windows asks whether you want to remove files securely or quickly. Quick removal is faster but leaves traces of deleted files on the hard drive. find removal takes longer but overwrites the space so deleted files cannot be recovered. For a computer you are keeping, quick is fine. For a computer you are selling or giving away, choose find removal.

Windows will then show a summary of what will happen. Click Reset to begin. Your computer will restart and show a progress screen. Do not turn off your computer or unplug it during this time. The process usually takes one to two hours. When it finishes, your computer will restart and show the Windows setup screen, where you will create a new account or sign in with a Microsoft account.

How to Master Reset a Mac Computer

On a Mac with an Apple silicon chip (M1, M2, M3, or newer), click the Apple menu in the top left corner and select System Settings. Click General in the left sidebar, then click Transfer or Reset at the bottom of the window. Click Erase All Content and Settings.

A warning will appear explaining that this action erases all data and settings. Click Continue. You will be asked to sign in with your Apple ID. Enter your credentials and click Continue. If you have two-factor authentication turned on, you will need to complete that step as well.

Mac will then ask whether you want to keep or erase your iCloud data. If you choose to erase, your iCloud account will be removed from the computer. Click Continue. A final confirmation screen will appear. Click Erase to begin the reset. Your Mac will restart and show a progress bar. The process usually takes 15 to 30 minutes.

On older Macs with Intel processors, the process is different. Click the Apple menu, select System Preferences, then click Erase and Reinstall. Follow the on-screen instructions. If you are unsure which processor your Mac has, click the Apple menu, select About This Mac, and look at the Processor line.

What Happens During the Reset Process

Once you click the final confirmation button, your computer takes over and you cannot stop it without losing data. Windows or Mac will restart your computer several times. You will see progress screens, loading bars, and possibly blank screens. This is normal. Do not turn off your computer, unplug it, or close the lid.

On Windows, you may see a screen that says "Getting ready" or "Resetting your PC" with a percentage. This can stay at 0% for several minutes before moving. On Mac, you will see a progress bar that fills slowly. Both processes are working even if nothing appears to be happening.

If your computer loses power during a reset, it may not restart properly. If this happens, restart it manually and it will usually resume the reset process. If it does not, you may need to reinstall Windows or macOS from a USB drive, which requires a different set of steps.

Setting Up Your Computer After the Reset

When the reset finishes, your computer will show the initial setup screen you saw when it was brand new. On Windows, you will create a local account or sign in with a Microsoft account. On Mac, you will create a local account or sign in with an Apple ID. Choose the option that matches how you plan to use the computer.

After setup completes, your desktop will be empty. You will need to reinstall any programs you use regularly. read them from the publisher's website or from the Microsoft Store or Mac App Store. You will also need to sign back into email, social media, and other accounts. Have your usernames and passwords ready.

Restore your files from the backup you created before the reset. If you backed up to an external drive, connect it and copy your files back to the appropriate folders. If you backed up to cloud storage like OneDrive, Google Drive, or iCloud, sign in and read your files. This step can take a while if you have many large files.

Common Mistakes to Avoid

The biggest mistake is not backing up your files first. Once the reset starts, there is no way to recover deleted files. Before you begin, copy everything you want to keep to an external drive or cloud storage. Test that the backup works by opening a few files from the backup location.

Another common mistake is turning off the computer during the reset. Even if the process seems stuck, wait at least 30 minutes before doing anything. Progress bars can move very slowly, especially on older computers. If your computer has not shown any change in two hours, then it may be stuck, but this is rare.

Do not forget to write down license keys for programs you own before the reset. After the reset, you will need these keys to reinstall the programs. Check your email for confirmation messages from software publishers—these often contain license keys. Take screenshots of any important information you might need later.

When to Choose a Different Solution

A master reset is not always the right answer. If your computer is running slowly, try restarting it first, then uninstalling programs you no longer use. If a specific program is crashing, uninstall and reinstall just that program instead of resetting the entire computer. If you think you have malware, run a full scan with Windows Defender or a third-party antivirus program before resorting to a reset.

If your computer will not start at all, a master reset may not be possible without a Windows or macOS installation USB drive. If you see error messages during startup, try restarting in Safe Mode first. On Windows, restart and press F8 or Shift+F8 repeatedly during startup. On Mac, restart and hold Shift. Safe Mode can sometimes fix problems without erasing your data.

If you are selling your computer and want to erase your data but keep the operating system, you do not need a full master reset. On Windows, use the Remove everything option. On Mac, use Erase and Reinstall. Both options erase your personal data while leaving the operating system ready for the next owner.

Frequently Asked Questions

Will a master reset remove viruses and malware?

Yes. A master reset erases everything on your hard drive, including any malware. However, if the malware is on a USB drive or external hard drive you connect afterward, it can infect your computer again. Scan any external drives with antivirus software before connecting them to your freshly reset computer.

Can I undo a master reset after it starts?

No. Once the reset process begins, you cannot stop it without potentially damaging your operating system. If you change your mind, wait for the reset to finish, then restore your files from your backup. This is why backing up before you start is essential.

Do I need the Windows or macOS installation disc to do a master reset?

No. The Reset this PC option on Windows and Erase and Reinstall on Mac both read the operating system from the internet during the reset process. You need an internet connection, but you do not need a disc or USB drive. If your internet is very slow, the process will take longer.

How long does a master reset actually take?

On average, 30 minutes to two hours. Older computers and computers with large hard drives take longer. Computers with solid-state drives (SSDs) are usually faster. The progress bar does not always move at a steady pace—it may appear stuck for 10 or 15 minutes, then jump ahead suddenly.

What should I do if my computer gets stuck during the reset?

Wait at least 30 minutes before assuming it is stuck. If nothing has changed after two hours, restart your computer manually by holding the power button for 10 seconds. When it restarts, it will usually resume the reset process. If it does not, you may need to reinstall Windows or macOS from a USB drive.