It depends on which strain of low risk HPV you had when you had warts. Gardasil only covers 4 strains (out of over 30) of HPV: 2 which lead to the majority of cases of genital warts and 2 which lead to the majority of the cases of cervical cancer.
Are you still contagious? It depends on which doctor or researcher you talk with. Some say someone is contagious for life, others say someone isn't. I don't know which is right.