Good morning. See if you are able to perform these steps. Right-click on the start menu button and select Run.
The Run box will open.
In the text area type: ms-settings: (the colon is mandatory) and click OK.
In the Settings window
click Family & other people
click Add someone else to this PC
click I don't have this person's sign-in information
click Add a user without a Microsoft account
create a user name
create a password ***** enter it twice
create a password ***** and click Next
You'll then see the account listed
click on it and click on Change account type
change Account Type to Administrator and click OK
Restart the computer and sign in as the new user.
Let me know if the internet connection starts working or if the start menu works
when logged in as the new user.