Try booting into the setup menu. This is usually done by repeatedly pressing F2 while your computer is booting and before windows starts. This is the bios and you should only change/setup the password and then get back out of there unless you know exactly what you are doing. When you have made your changes you need to save the change and then exit bios. You may see an option to save changes, if you see it, do it. If not, press esc and it will probably ask if you want to save changes.