Rising Sun problem

[Bioman]

I have the John Tiller Campaign Series games and I can not start the Rising Sun portion of the of the game. East Front and West Front work fine. When I try to start Rising Sun I get an error message saying that the rising sun.exe file is from an unknown publisher. If I allow it to start the main menu screen appears but it looks odd as the colors are off. I can select a scenario but when it loads the mapscreen is completely white.

I have tried to uninstall and reinstall the series on a number of occasions but the problem still persists.

I suppose that I can live without Rising Sun working as I don't play it very much but it would be nice if it worked.

Nick