Protected by a password authentication system

Our laptop was stolen, but later recovered.  However, when we got it back it goes to a white screen with the following message:

"This computer system, #_______-____, is protected by a password authentication system. You cannot access the data on this computer without a correct paswword.

Please type in the system or administrator password and press Enter."

Is this a Bios password?  If so, how do I go about getting this reset?

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