Firstly id like to thank you for replying. Yes the base game worked fine but marines wont and i didnt have to add DEP exceptions the first time i installed the game which was on the same laptop i am using now. The base game is the Paradox retail version purchased on ebay while the Marines module(disc version) was purchased seperately from Battlefront. I have Norton internet security but i turned it off and the game still wont start so i dont think that is causing the problem and i am sure it is installed in the right directory. However sometimes when i try to run the game the screen goes black as if it loading and the marines icon with the green light appears in the bottom left corner of the screen as it does in the game menu but the rest of the screen remains black. Does this mean the module did not install properly?