Problem with launching the game.

A couple of years ago, I bought the "Heroes of Might and Magic V: Gold Edition" from Buky, of course. Back then, when I bought the game, my operating system was Windows XP, but now that I've updated my software and installed Windows 7, the game won't start! "Heroes of Might and Magic V" and "Heroes of Might and Magic V: Hammers of Fate" start without any problems, but there are issues with "Tribes of the East." You see, when I start the game, a dialog box (splash screen) appears, but then the program stops responding. I tried installing patch 3.1, but the problem remains. Can you explain what I should do?
Thank you.