Locked out of account after installing Windows Live Family Safety

I have installed Windows Essentials in order to get Live Family Safety on my computer and set up an adult account, but now it will not let me access my computer except through this account. When I try and access what comes up as the Owner account it asks me for an administrator password. I can now not access any of my files, photos etc. When I try and uninstall Live Family Safety or restore system I am again asked for an administrator password, but I don't believe I ever had one. My computer is a Dell Inspiron and I have Windows 7.