I had bought this program

Question

I had bought this program My Maillist Deluxe worked great then my computer quit so I had to buy a new computer and this one has windows Vista instead of Xp like my old onewhen installed for a couple of names it worked good but i have a customer who gave me a disk with almost 400,000 names and addresses on it i installed the names and it was fine but now i cant open the program at all so i wondered if you had any ideas why or maybe an update for Vista program