How to Uninstall Windows 10 (Step-by-Step Guide)

Uninstalling Windows 10 means removing it from your computer entirely, usually to install a different operating system (like Linux or an older Windows) or to wipe the drive before selling or recycling the PC. This guide covers the two main scenarios: replacing Windows 10 with another OS via a bootable USB, and performing a clean install of a different Windows version. You’ll need to back up your files first, because this process erases everything on the system drive.

What You’ll Need

• A USB flash drive (8 GB or larger) with the new operating system’s installation media (e.g., Linux ISO or Windows 11 installer).
• Another computer to create the bootable USB, if needed.
• Your Windows 10 product key (only if you plan to reinstall Windows later).
• External backup drive or cloud storage for your personal files.
• Access to your PC’s BIOS/UEFI (usually by pressing Del, F2, F12, or Esc during startup).

Step-by-Step

1. Back up your data. Copy documents, photos, videos, and any other important files to an external drive or cloud service. Also note any software licenses or settings you’ll need to reconfigure later.
2. Create installation media for the new OS. On another computer, download the ISO file for the OS you want to install (e.g., Ubuntu, Fedora, Windows 11). Use a tool like Rufus (Windows) or balenaEtcher (macOS/Linux) to write the ISO to the USB drive. This will erase the USB’s contents.
3. Disable Secure Boot and Fast Boot (if needed). Many modern PCs have Secure Boot enabled, which can prevent booting from unofficial media. Restart your PC, enter BIOS/UEFI, and look for Secure Boot or Fast Boot settings. Disable them if you’re installing a non-Windows OS or if the USB doesn’t boot. Save changes and exit.
4. Boot from the USB drive. Insert the USB into your PC. Restart and press the key to enter the boot menu (often F12, F11, or Esc). Select your USB drive from the list. If you don’t see it, re-check the boot order in BIOS.
5. Start the new OS installer. Once the USB boots, you’ll see the installer’s welcome screen. Follow the on-screen prompts until you reach the disk partitioning step.
6. Delete the Windows 10 partitions. In the installer, when asked where to install, you’ll see a list of partitions. Select each partition that belongs to Windows 10 (usually labeled as “Type: NTFS” or “System Reserved”) and choose “Delete” for each. This removes Windows 10 and its boot loader. If you see multiple partitions, delete them all until the disk shows as “Unallocated Space.”
7. Install the new OS. Select the unallocated space and click “Next” (or “Install Now”). The installer will create its own partitions and copy files. Follow the rest of the prompts to complete the installation.
8. Format the drive (if just wiping the PC). If you don’t plan to install a new OS and just want to erase Windows 10, you can boot from a USB with a live Linux environment (like Ubuntu’s “Try Ubuntu” mode), open GParted, and format the drive as ext4 or NTFS. Or, use the Windows 10 installation media itself: boot from it, choose “Custom: Install Windows only,” then delete all partitions and let Windows reinstall—but that’s technically reinstalling, not uninstalling.

Common Mistakes

• Not backing up files. Deleting partitions erases everything. If you forget to back up, your data is gone for good.
• Deleting the wrong drive. If you have multiple hard drives, you might accidentally wipe the wrong one. Double-check the disk number and size in the installer.
• Forgetting to disable Secure Boot. Some Linux distributions won’t boot with Secure Boot enabled. If the USB doesn’t appear, this is a common cause.
• Using a USB that’s too small. Windows 11 installation media requires at least 8 GB. A 4 GB stick will fail.
• Not changing boot order. If the PC boots straight into Windows, you didn’t press the boot menu key in time or the USB isn’t recognized.

Tips

• Use a wired internet connection during installation to avoid driver issues.
• Keep your Windows product key if you might want to reinstall Windows 10 later—it’s often tied to your Microsoft account, but having the key helps.
• Test the new OS from the USB first (e.g., “Try Ubuntu”) to make sure your hardware works before wiping Windows.
• Write down your current network settings if you use a static IP, as you’ll need to reconfigure them.
• If you’re selling the PC, consider a secure erase (like DBAN) instead of just deleting partitions, to prevent data recovery.

Troubleshooting

• USB not booting? Re-enter BIOS and check boot order. Ensure the USB is formatted as FAT32 (or use Rufus’s GPT/UEFI settings). Try a different USB port (USB 2.0 often works better).
• Installer says “Windows cannot be installed on this drive”? This usually means the disk is MBR but your system is UEFI, or vice versa. You may need to convert the disk to GPT (using diskpart in the installer’s command prompt) or enable Legacy/CSM boot in BIOS.
• Can’t see the USB in BIOS? Disable Fast Boot and try again. Also, some BIOSes require you to enable “USB Boot” or “Legacy USB Support.”
• Installation fails halfway? Re-download the ISO and recreate the USB—corrupted downloads are common. Also check your RAM with Memtest86 if crashes persist.
• After installing Linux, Windows is still in the boot menu? This is a leftover boot entry. You can remove it later with efibootmgr (Linux) or by reinstalling GRUB.

Frequently Asked Questions

Can I uninstall Windows 10 without a USB drive?

No. To remove Windows 10, you need to boot from another OS (via USB or DVD). You cannot delete the running OS from within itself.

Will uninstalling Windows 10 void my warranty?

No, but if you replace the OS, some manufacturers may not provide support for that OS. The hardware warranty remains valid.

Can I go back to Windows 10 after uninstalling it?

Yes, as long as you have a valid product key and installation media. You can reinstall Windows 10 anytime, but you’ll lose the other OS’s files unless you back them up.

What happens to my files when I uninstall Windows 10?

All files on the system drive (usually C:) are deleted. Files on other drives (D:, E:) remain untouched, but it’s safest to back up everything.

Is uninstalling Windows 10 the same as a factory reset?

No. A factory reset reinstalls Windows 10 to its original state. Uninstalling removes Windows entirely.

Do I need to deactivate Windows before uninstalling?

No, Windows activation is tied to your hardware and Microsoft account. When you reinstall, it will reactivate automatically if the hardware hasn’t changed.

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