ThisCalculator

Everyday

How to Upgrade to Windows 11 Safely (Keep Files & Apps)

Updated · Standard formula, shown below

How to Upgrade to Windows 11 Safely (Keep Files & Apps)

This guide walks you through upgrading to Windows 11 while keeping your personal files and installed applications intact. You’ll learn how to check compatibility, back up your data, perform the upgrade, and handle common issues—so the transition is as smooth as possible.

What You’ll Need

  • A PC that meets Windows 11 minimum requirements (see Step 1).
  • At least 64 GB of free storage space (more if you have many apps).
  • An internet connection to download the installation files.
  • Your Windows product key (usually not needed if Windows is already activated, but good to have).
  • An external drive or cloud storage for backup (strongly recommended).

Step-by-Step

  1. Check compatibility. Open the PC Health Check app (download from Microsoft’s website if not preinstalled) and click “Check now.” It will tell you if your PC meets Windows 11 requirements: a compatible 64-bit processor, 4 GB RAM, 64 GB storage, UEFI secure boot, and TPM 2.0. If it fails, you may need to enable TPM in BIOS or consider hardware upgrades.
  2. Back up your files. Even though the upgrade preserves files, a backup protects you from unexpected issues. Copy important documents, photos, and videos to an external drive, or use a cloud service like OneDrive. Also note your installed apps (you can export a list via PowerShell: Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName | Sort-Object DisplayName).
  3. Update Windows 10. Ensure your current Windows 10 is fully updated. Go to Settings > Update & Security > Windows Update and click “Check for updates.” Install all pending updates, including optional ones. This reduces upgrade errors.
  4. Free up disk space. Windows 11 needs at least 64 GB free. Use Disk Cleanup or Storage Sense to remove temporary files, old downloads, and recycle bin items. Uninstall large apps you no longer use.
  5. Disable third-party antivirus temporarily. Some security software can interfere with the upgrade. If you use a third-party antivirus, disable its real-time protection (or uninstall it temporarily) before starting. You can re-enable it after the upgrade.
  6. Start the upgrade. Go to Settings > Update & Security > Windows Update and click “Check for updates.” If Windows 11 is offered, you’ll see “Upgrade to Windows 11 is ready.” Click “Download and install.” Alternatively, use the Windows 11 Installation Assistant from Microsoft’s website—it’s the easiest method for most users.
  7. Choose to keep files and apps. When prompted, select “Keep personal files and apps.” This is the default, but verify it before proceeding. If you accidentally choose “Keep nothing,” you’ll lose everything.
  8. Let the installation run. The PC will restart several times. Do not turn it off or unplug it. The process can take 30 minutes to a few hours depending on your hardware. Keep it plugged in if it’s a laptop.
  9. Complete setup. After installation, you’ll go through the out-of-box experience (OOBE): choose region, keyboard layout, sign in with your Microsoft account (or create a local account), and customize privacy settings. You can skip most of these.
  10. Verify your files and apps. After reaching the desktop, check that your files are in the same locations (Documents, Pictures, etc.) and that your apps appear in the Start menu. If any app is missing, you may need to reinstall it—but most should carry over.
  11. Re-enable antivirus and check updates. Turn your third-party antivirus back on, then go to Settings > Windows Update and check for updates to get the latest drivers and security patches.

Common Mistakes

  • Not checking compatibility first. Trying to upgrade an unsupported PC can lead to installation failure or a system that won’t boot. Always run PC Health Check.
  • Skipping backup. Even though the upgrade preserves files, a power outage or software bug can corrupt data. A backup is your safety net.
  • Choosing “Keep nothing” accidentally. Read the prompt carefully. If you select the wrong option, you’ll lose all files and apps.
  • Disabling Secure Boot or TPM. Some users disable these for other OSes; Windows 11 requires them. Re-enable them in BIOS before upgrading.
  • Ignoring driver updates. Outdated drivers (especially GPU and network) can cause issues after upgrade. Update them beforehand if possible.

Tips

  • Use the Installation Assistant rather than the Media Creation Tool if you’re upgrading on a single PC—it’s simpler and keeps your files automatically.
  • Uninstall old, unused apps before upgrading to reduce the chance of compatibility issues and speed up the process.
  • Keep your PC plugged in during the entire upgrade to avoid battery drain causing a shutdown mid-install.
  • Create a system restore point before starting (search “Create a restore point” in Control Panel). This lets you roll back if something goes wrong.
  • After upgrade, check app compatibility—some older apps may need updating. Visit the developer’s website for Windows 11 versions.

Troubleshooting

  • Upgrade fails with an error code. Note the error code (e.g., 0x80070004). Search Microsoft’s support site for that code. Common fixes: free more disk space, disable USB devices, or run Windows Update troubleshooter.
  • PC Health Check says “This PC can’t run Windows 11.” Enable TPM 2.0 and Secure Boot in your BIOS (restart, press F2/Del to enter setup). If your CPU isn’t listed as supported, you may need to replace hardware or stay on Windows 10.
  • Installation gets stuck at a percentage. Wait at least 2 hours before assuming it’s stuck. If it doesn’t progress, restart the PC and try again. Sometimes it resumes.
  • After upgrade, some apps don’t work. Try reinstalling them. If they’re 32-bit, they should work, but some old apps may need compatibility mode: right-click the app, go to Properties > Compatibility, and run in Windows 8 or 7 mode.
  • Files missing after upgrade. Check C:\Windows.old folder—it contains your previous Windows installation, including user files. You can copy from there. If you can’t find files, restore from backup.
  • You want to go back to Windows 10. Within 10 days of upgrading, go to Settings > System > Recovery and select “Go back.” This removes Windows 11 and restores your previous setup.

Frequently Asked Questions

Will I lose my files and apps during the upgrade?

No, if you select “Keep personal files and apps,” your files, settings, and most apps will be preserved. It’s still recommended to back up, just in case.

Is Windows 11 free?

Yes, if you have a genuine Windows 10 license, the upgrade to Windows 11 is free. Your license transfers automatically.

Can I upgrade if my PC doesn’t have TPM 2.0?

Officially, no. Microsoft requires TPM 2.0 for Windows 11. Some users have found workarounds, but they’re unsupported and may cause stability issues. It’s safer to upgrade hardware or stay on Windows 10.

How long does the upgrade take?

Typically 30 minutes to 1 hour, but it can take longer on older hardware or if you have many apps. Plan for a few hours.

What if I don’t like Windows 11?

You have 10 days to roll back to Windows 10 via Settings > System > Recovery > Go back. After that, you’d need to reinstall Windows 10 from scratch.

Do I need to reinstall my apps after upgrading?

No, most apps will remain installed. However, some apps may need to be updated or reinstalled if they’re not compatible with Windows 11.

Related

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.