Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.
Work through these checks
0 of 3 complete01Please enter a valid Retail/OEM activation key
Please enter a valid Retail/OEM activation key.
Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.
02Link your local account with Microsoft account
Link your local account with Microsoft account.
Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.
03Run the Activation Troubleshooter
Run the Activation Troubleshooter.
Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.
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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