I (now using Win 8)have this problem as well. I purchased all the games/modules (Normandy/Commonwealth/Italy) when they were released but only now installed them as I didn't have a PC capable of running them smoothly.
The soldiers in Normandy have always been invisible since I installed all the products about a hour ago. The soldiers in Fortress Italy are fine, as visible as visible can be.
Vehicles are fine, and look damn good to boot.
If this is fact a .BRZ file, or anything else, please fix it, as the game is unplayable, or at not enjoyable, watching a bunch of Claude Rains running around.