Useful information: HoMM3 Software.

I don't know if this applies here, but when installing Win 7, the Hamachi network doesn't appear in the network connections and doesn't work accordingly. The solution: Find and install Hamachi version 2.2.0.328 (do not install later versions!!). After installation, don't launch it immediately, but check in the Device Manager for the correct operation of the Hamachi network adapter and the Hamachi network connection. If everything is okay, then launch Hamachi and update it.... After version 2.2.0.328, there have been several new versions, and they all contain problems with adapter installation.