Computer locked by Norton Anti-theft, unable to solve

Hi.

I have a laptop which was left untouched for quite a while. Recently, when I tried to switch it on, I got this message instead: 

This computer has been disabled using Intel (R) AT.

Intel (R) AT system lock due to: Platform Attack Detected

Please select one of the following for platform recovery:

1 - Passphrase

2 - Server Recovery Token

And then at the end, it says: Unlock with Norton Anti - Theft. 

And so, here I am.

I don't even remember keying in anything for "passphrase" and "server recovery token". How do I solve this? Or do I have to throw away this laptop and get a new one?

Hoping for some advice, thanks.