This copy of windows is not genuine

Hey guys i got some problems with my laptop..

Its says this copy of windows is not genuine..
I try to do with windows powershell and type SFC /SCANNOW but it say windows found corrupt file cbs.log

I dont know how to fix it please help me guys.
I cant use internet when "this copy of windows is not genuine" showing

Thanks guys

Re enter your key.

You have to connect to the internet to reactivate windows.

a system file check has nothing to do with windows showing not genuine and won`t help.

But when that showing when i connect to internet it always say no internet access..

And i buy this laptop 5 years ago.