Fix Windows activation error 0xC004C060

Why you see error 0xC004C060 in Windows 11/10 activation and proven fixes you should try before buying a new key.

Quick fixes (try these first)

Double-check that you typed the 25-character key correctly — one wrong character triggers 0xC004C060.
Run **slmgr /ato** in an elevated Command Prompt to force re-activation.
Make sure your PC date and time are correct. An invalid clock can cause activation to fail.
If you upgraded hardware, sign in with a Microsoft account and use **Activation Troubleshooter**.
Still failing? The key is likely blocked. Ask the seller for a replacement or refund.

If all steps fail, the key is permanently blocked. You’ll need a fresh, legitimate licence. Below are activation-tested options that work first try.

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Is 0xC004C060 permanent?

No. It simply means Microsoft can’t validate the key you entered. Correcting the key or using Activation Troubleshooter usually resolves it.

Can Microsoft unblock the key?

Only if it was blocked by mistake. Keys sold in large volume (e.g. MSDN or OEM misuse) stay permanently blacklisted.