Has this computer been joined to a domain at any point?
Usually you get that message when trying to log in with a domain account but there are no domain controllers present to authenticate your credentials (and nothing cached locally).
If you aren't on a domain you need to log in as a local user. Put your username as .\username
For example if my account was called User1 I would log in as .\User1
PS.
If you don't know the username/password for your local account I can't help you as it would be breaking forum rules.