Nothing we can do, sorry. The product reached end-of-life/end-of-support almost 3 years ago.
Your only recourse is the original owner of the machine, or the maker of it.
Support to Anti-theft Service ended 2 years back.
If your device is locked you may be able to retrieve your unlock password through the Anti-Theft web portal through the expired subscriptions link on the subscription page of My Account. Support does not have access to your password.The ability to unlock your device remains unchanged; you will need to enter your 8 character unlock password. If you are unable to remember or recover your unlock password, the Anti-Theft service will follow its design and lock the device. At this point, your only option would be to contact your computer’s manufacturer to request service - in most cases this means replacing the motherboard.