the game crashes when loading with a GeForce 8600 GT. Auto-translated

Help! In 90 out of 100 cases, Heroes 5 crashes when loading. That is, the first image appears, and then everything goes black and an error message is displayed. The game is a licensed version, as is the Windows operating system. The graphics card is a GeForce 8600 GT, with 2GB of RAM, a 2.2 GHz clock speed, and a dual-core processor. What should I do? I really want to be able to play the game properly!

Exactly the same problem. The first time I launched the game, I played normally, and everything was fine. Subsequent attempts only show the starting image; when I click "Start Game," the image disappears, and it's as if I didn't click anything. No errors are displayed. I've reinstalled the game and installed all the codecs, but nothing helps. My hardware is identical, except I have a 4-core processor. I've been struggling with this for 3 days now.

I reflashed the BIOS, and it seems to be working for now, but I've only played a couple of times.