Your wife can stil petition for a greencard for you even thought your visa has expired. The process takes about 6 months and there are several forms and requirements. You can find more information on the USCIS website. www.uscis.com. It may be helpful to retain an attorney for this process, as if it is done incorrectly, you could be put in removal proceedings for being here unlawfully. Unlawful presense for over 1yr triggers a 10yr ban once an indvidiual leaves the U.S.
Feel free to call me for a free consultation. I have experience with marriage-based greencards. (206) 724-1940.
Andre Olivie, Esq.
U.S. Immigration Lawyer