Problem with Roman Civil Wars

[billk1]

When ever I click on the icon to start the game I get the following message,"Cannot find the specified files. Make sure the path and filename are correct". I get the same message when clicking on the Jerusalem add-on. In both cases I click ok at the bottom of the message box, I get a blank white screen that is titled Credits, then the game starts and plays. Does anyone know why this is happening. I am using Win7 64 bit.

Also what scenarios should I have in my game from adding in the Jerusalem Expansion pack.