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Fix Windows that has activation failed

We'll run the Activation troubleshooter, re-enter the product key, link your Microsoft account—or tell you when to contact Microsoft.

Troubleshooting · Home maintenance
10–20 min
What you'll need
  • Product key (if you have one)
  • Microsoft account (for digital license)
  • Internet connection
Step 1 of 5

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Steps

Goal: Run the Activation troubleshooter, re-enter the product key, and link your Microsoft account.

  • Open Settings, System, Activation. Click Troubleshoot.
  • Good: The troubleshooter fixes the issue. You are done.
  • Bad: Proceed to Re-enter product key.

Run troubleshooter

Goal: Let Windows try to fix activation.

  • Settings, System, Activation, Troubleshoot. Follow the prompts. If you changed hardware, select “I changed hardware on this device.”
  • Good: Activation succeeds. You are done.
  • Bad: Proceed to Re-enter product key.

Re-enter product key

Goal: Enter your product key or sign in with Microsoft account.

  • Settings, System, Activation, Change product key. Enter your 25-character key. Or sign in with the Microsoft account linked to your digital license.
  • Good: Windows activates. You are done.
  • Bad: Contact Microsoft support with your product key and proof of purchase.

When to get help

Contact Microsoft support if:

  • The troubleshooter and product key do not work.
  • You changed hardware and the digital license does not transfer.
  • You get error 0x8007007B or 0xC004F074.

Have your product key and proof of purchase ready.

Verification

  • Settings, System, Activation shows “Windows is activated.”
  • No “Activate Windows” watermark on the desktop.
  • No activation warnings.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Troubleshooter Settings, System, Activation, Troubleshoot.
  2. Product key Change product key; enter 25-character key.
  3. Microsoft account Sign in with account linked to digital license.
  4. Hardware change Troubleshooter, "I changed hardware."
  5. Contact Microsoft Support with product key and proof of purchase.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Windows edition and version
  • Product key (last 5 digits only if sharing)
  • Whether hardware was changed
  • Error code (if any)
  • Steps already tried

Have you run the Activation troubleshooter?

It fixes many activation issues.

Settings, System, Activation, Troubleshoot. Follow the prompts. Fixed: done. Not fixed: re-enter product key or sign in with Microsoft account.

Yes No

You can change your answer later.

Run Activation troubleshooter

Settings, System, Activation, Troubleshoot. Apply any fixes. Retry activation.

Done

Re-enter product key or sign in

Change product key: Settings, Activation, Change product key. Or sign in with Microsoft account if you have a digital license. Restart. Check activation.

Yes No

You can change your answer later.

Windows activated

Activation succeeded. You are done.

Done

Contact Microsoft

Contact Microsoft support. Have product key and proof of purchase. Error codes 0x8007007B or 0xC004F074 may need support.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would Windows activation fail?
Wrong or invalid product key, major hardware change (new motherboard), not signed in with the correct Microsoft account, or Microsoft activation server issue. Run the Activation troubleshooter first.
Can I fix Windows activation myself?
Yes. Run the Activation troubleshooter, re-enter the product key, sign in with your Microsoft account, restart. If you changed hardware, you may need to reactivate or contact Microsoft.
When should I contact Microsoft for activation?
If the troubleshooter and product key do not work, you changed hardware and the digital license does not transfer, or you get a specific error. Have your product key and proof of purchase ready.

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