How do I find out my password to my Acer AS1410-2801-USLV7HP64DSU2300V2GV160V6LV1?

I have had my Acer Notebook in Storage for years while in Alaska and cannot find the password that I need for the Security Password on my Notebook. How could I go about finding this password or perhaps could I change it to a new one. I cannot log on to my Notebook with out the password. 

Thank you,

With Respect,

Joanne Neyman.