windows 10 doesn't work

If Windows 10 shows as not activated after the upgrade from Windows 8, these are the supported checks and next steps:

1. Run the Activation Troubleshooter again from the correct location:
   • Start > Settings > Update & Security > Activation > Troubleshoot
   • This requires an internet connection and administrator access.
2. Check whether the installed edition matches the license:
   • Go to Start > Settings > Update & Security > Activation.
   • If the installed edition does not match the license, Windows will not activate.
   • If the troubleshooter detects a valid digital license for a different edition, it can show how to install the correct edition.
3. If this is the first time Windows 10 was installed on that PC, Windows needs either:
   • a valid 25-character Windows 10 product key, or
   • a Windows 10 digital license.
4. If major hardware was changed, especially the motherboard, Windows may no longer find the license associated with the device. In that case:
   • go to Start > Settings > Update & Security > Activation > Troubleshoot
   • if available, use the reactivation path after a hardware change.
5. If none of that works, contact support. The provided material also states that if Windows 10 was preinstalled and activation still fails after troubleshooting, contacting the PC manufacturer may be required.

• Using the Windows Activation troubleshooter
• Fix Windows 10 activation error 0x803F7001
• Activate Windows