You may encounter issues while trying to activate Windows 10 after re-installing the operating system on your computer that you have not encountered before. Activation issues can arise for various reasons:
Internet Connectivity or an outage (Network driver not native to system, power outage locally etc.)
Hardware change in the system
Incorrect OS Version
Microsoft has developed an on-line troubleshooter for Windows Activation issues.
Once any Internet connectivity issues have been resolved, if activation issues persist, you can use the tool above to troubleshoot your activation issue.
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