Techie question

My granddaughter gave her old laptop to her aunt. It's an Asus D550M. My granddaughter hasn't used the computer in over a year. When I fired it up to do the setup for the new owner, I kicked me to the Bios Screen and I found the battery was so low the clock had lost its time keeping. So I set it the time and date. I was then able to get into the computer, not thinking about what was going to happen when I restarted the computer. I uninstalled a program and it wanted to restart the computer. When it came back up, it went to the standard Windows 8 login and wanted my granddaughters password.

Now here's the rub. My granddaughter doesn't remember the password. She sent me 6 possibles and non of them worked.

Is there anyway to force the computer back to factory defaults, so I can set it up from scratch?