it won't activate if you don't add any users - so most likely you have, you just need to work out their names.
if not. just do a machine recovery.
I have added the users but after the fact. What is involved in a machine recovery?
Look up "recovering systems and users" in your EEPC product guide - it explains the process. Again though, if the pre-boot is active, there MUST be users assigned to the machine.