The game crashes during the Inferno campaign – mission 3.

The problem is with the game itself. No matter how hard I try, I can't continue playing. When loading the 3rd mission of the Inferno campaign, the game crashes to the desktop, reporting an error in ntdll.dll. I've patched the game to version 1.5, but that doesn't help. The only solution is to load a save file with all the previously completed campaigns, but that makes the game less interesting. I tried playing the 4th mission, saved there, replaced the old save files, and completed the 4th mission, but without completing the 3rd mission, the 4th and 5th missions remain inactive. I don't know what to do.