If you doubt the legality of your original marriage and want to get remarried legally, it is best to talk with the local government official in charge of marriages.
More on Renewing Your Marriage Vows
Vow Renewal Etiquette
Renewing Your Wedding Vows – A Guide to the Etiquette of Vow Renewal
Wedding Vows Renewal
Vow Renewal – What is a Vow Renewal?
How to Plan a Vow Renewal Ceremony
What is a Wedding – The Parts of a Wedding