ewgeniy
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I'm not very good at Heroes 4, but the first thing that comes to mind is to try reinstalling your video drivers (download them from the official website), try reinstalling DirectX, and make sure the problem is actually with your computer and not with a pirated disc, for example. You can also try playing around with the sound settings if nothing else helps.
Но поскольку я нищий,
у меня лишь есть мечты.
Я разостлал свои мечты пред вашими ногами.
Ступайте бережно, ибо вы ступаете по моим мечтам.