Changed computers and email address and need to activate

I recently changed computers and email address.  I do not have access to the old email that was related to the original purchase of Adobe Acrobat 7 Professional.  When I received my new computer I installed using the disc from the purchased copy and entered the serial Number etc.. but it only allowed a 30 day period.  Received a message advising needed to activate product either online or via phone - tried both ways but unsuccessful.  Now 30 day trial us up and I want to activate - Any step by Step guidance on how I can activate my product on my new computer would be helpful.