During the install of the game, Windows' Scripting Host showed me an error that it could not execute the firewall.vbs file, because it was not found.
This error didn’t mean that the game wouldn’t run, it just means that the Windows firewall settings are not setup correctly for use with MOH.
First time you run the game Windows firewall will ask you if you want to block or unblock the game or ask later. You can choose whatever fits your needs; it shouldn’t be too much of a problem.
Multiplayer MOH needs to be unblocked to be played properly.
I installed the patch v1.1 that is available for MOH as well to guarantee the best playing experience.