Cant't sign up to Norton Family

Hello, i can't login to Norton Family, email + pass = OK, but aplication reports "no child account login, or check, if you are connected to Internet and try later."

Well... I don't need this NF aplication, because i have no chilrdern. During uninstallation are troubles (Win 7 Home) :(. Have someone idea, how delete this apli from PC?

Thx.