The old thread seems to have been deleted, so here's a common place to talk about the issue that many were having. A .dll fix was posted but I don't remember it. If someone could post it here that would be awesome.****EDIT**** The following fix was found, however, IT MAY NOT WORK FOR EVERYONE. There are many great suggestions in this thread and one of them may work for you.
First of all, download a file from here (all credit goes to tomsons26)
****But here's the thing, the guide is somewhat misleading so do not follow the guide there, instead, do this :
Ignore the EugLoadingBar the guide told you to, set only the ActofWar.exe in Vista SP1 compatibility mode
Apply the dll you downloaded from there.
Then you should be able to run the game, HOWEVER -> some people may experience another error caused by the "Run as Admin?", if this happens to you, try unchecking the "run as administrator" box in ActofWar.exe, if it still doesn't work you will have to try fiddle around with your Windows Security options, If you can get rid of the question box, the game WILL guarantee to run trust me.
Please spread this info to your friends as well if they can't get the game running, they need to know this, hopefully with this thread it can be more visible to you people.
Here is the updated solution to fixing the game.