Men of War Vista 64 not working

[gvmba]

Downloaded the Demo version and it works fine on my system but once I purchased the Steam Version I cant get passed the intro, I hear the audio track playing in the background but all I get is a black screen, I try ctrl-alt-del and nothing I have to hard boot the system, I tried it with a boxed copy afterwards and still nothing. Any ideas? I have had the problem of having to run some games in windowed mode, but I cant even force windowed on this game. Now I have two copies and still cant play.

Vista Ultimate 64
Intel Core 2 1.87ghz
Ati Radeon x1600
3gig Ram
1.5 TB HD