Save open work and back up important files. Use instructions for your exact device and software version. If Windows cannot start, see the startup guide.
Work through these checks
0 of 3 complete01Please enter a valid Retail/OEM activation key
- Please enter a valid Retail/OEM activation key
Check whether the original symptom still occurs.
If it does not helpContinue only if this check applies to your device. Consult its manufacturer if you are unsure.
02Link your local account with Microsoft account
- Link your local account with Microsoft account
Check whether the original symptom still occurs.
If it does not helpContinue only if this check applies to your device. Consult its manufacturer if you are unsure.
03Run the Activation Troubleshooter
- Run the Activation Troubleshooter
Check whether the original symptom still occurs.
If it does not helpContinue only if this check applies to your device. Consult its manufacturer if you are unsure.
Possible causes
- Loss of connection with the license server (KMS) of the company or school
- Error after hardware change
- Illegal activator lost functionality
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