You need to change some stuff in the registry editor. Do this:
Start->Registry Editor->HKEY_LOCAL_MACHINE->SOFTWARE->WOW6432NODE->New World Computing
Here you should see 2 folders that say Heroes of Might and Magic 3, both have subfolders called "1.0". If you click on the the upper HOMM3 1.0 subfolder, you'll see a file called CDDrive and the Data is C:. What you need to do is create this exact same file in the LOWER HOMM3 1.0 subfolder. Simply go into the lower HOMM3 1.0 subfolder, off to the side right click->New->String Value. Name it CDDrive, just like the other one, and set the path to C:
That should do it!
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