Posts from An error occurs while playing Heroes 3. Auto-translated

Heroes 3 is considered the best game in the entire series. Once, I was on YouTube and a Heroes 3 video caught my attention, where the author showed how to defeat dragons with a small army, dragons whose army consisted of 5 units of 300 dragons each, and I thought it was impossible, so I decided to watch the video. It turns out the author positioned his soldiers in such a way that when the dragons attacked the hero's army, they ended up attacking their own. I had forgotten that dragons have the ability to attack multiple opponents at once.

Anyway, I liked the video and I decided to install Heroes 3 to play the campaign. I have 3 parts: The Shadow of Death, Armageddon's Blade, and The Restoration of Erathia. I chose Armageddon's Blade. After an hour of playing, I received an error message, see screenshot. When I played on Windows 98, I didn't have these errors. What could be the problem?

I used to play on Windows 98, and I didn't have these errors. What could be the problem?

You answered the question yourself – you used to play in a different environment. If you play without the HD mod on new operating systems (Windows 7, Windows 10), you should at least set the compatibility mode for the executable file (to Windows 98).
In addition, you may have individual system problems (viruses, etc.).

It helped, I set the compatibility mode to Windows 98, and now it doesn't seem to crash anymore.

You can run the game under Windows 2000. Most likely, there won't be an error in this area, as it uses a different memory management system.