@XG440AV
Basically, you can't -- you have to contact HP to reset it.
I know we used to give out codes to bypass disable situations, but sorry -- the Community Policies changed this year such that we are now PROHIBITED from assisting customers in bypassing Admin or BIOS passwords, or in resetting those passwords.
For assistance in this NOW, you have to contact HP Customer Support directly as they will confirm ownership of the PC before providing any assistance -- something we are not able to do from here.
If you live in the US or Canada, contact information is on this page: http://www8.hp.com/us/en/contact-hp/phone-assist.html#section1
If you live elsewhere, contact information is on this page: http://www8.hp.com/us/en/contact-hp/ww-contact-us.html
NOTE: After you get through, stay on the line until you are finally able to talk to some one -- it can take a while!
If you have trouble finding a phone number, then try: 1 (650) 857-1501.
I am a volunteer and I do not work for, nor represent, HP