HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

Okay, but I no longer have the option for 4/3 resolutions, and without it, nothing else fits on the screen in windowed mode (I don't know how practical it is, but it would be nice to be able to play and chat at the same time).

My crash bug hasn't been fixed; I'm starting to suspect it's the operating system. I'll try installing everything on a netbook running Windows 7.