Hello,
I am Sumit, an Independent advisor and a Microsoft MVP here to help.
General guide for Activation error in Windows:
https://support.microsoft.com/en-in/help/10738/...
https://support.microsoft.com/en-in/help/12440/...
To better diagnose the issue,
Right click Start>Command Prompt-Admin and type in the following command:
slmgr.vbs /dlv
If you have Powershell instead of Command Prompt Run these in order:
cmd.exe
slmgr.vbs /dlv
You will get a window, take a screenshot using snipping tool and paste it it next reply.
How to get a screenshot and post back:
https://answers.microsoft.com/en-us/windows/wik...
Please let us know if you need any assistance in posting.