Emachines Reset Administrator Password?

I have an emachine that my uncle, used for a while and reset the admin password. He recently passed away so now I do not know how to get into the system. He had an administrator account. But I don't know the password. I've tried all I can think of, but doesn't work... Also i've tried to login in safe mode.. but the accounts screen comes up and there is only one account (My uncle's.. which is also the main admin account)... and there's a link under that says "reset password". Is there any free solution that I can use or do I have to go show to a technician or re-install?