Upgrade to 64 bit problem

I had a lifetime key for years for any DVD(Now HD) and have always been thrilled with the program.
Recently i upgrade my computer from 32 bit windows to 64 bit and discover that my registration key is no longer works.
Do i need to contact support about this or is there a fix or way to register the program in 64 bit win 7 with my original key ?
Thanks for any help any one might offer.
