Fireball
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On a 32-bit Vista, the fourth installment runs perfectly, but not on a 64-bit system (if anyone has managed to play it, please share their secrets). I think the issue lies in the fact that Heroes 4 has always had buggy interactions with RAM, which explains the cases of it constantly consuming all the memory and getting stuck in an endless swap, even on powerful computers. And in Vista 64, there are significant changes in how RAM is managed.