I hade a reinstall of rome total war 1.5 on my comp. Just as a note I am useing the RTW pack with Barbarian invasion. will that work?

any way. I reinstalled it and added the mod. every thing looks good. I try to make a custom battle. got a CTD. I try campaign got a CTD. I couldnt even begin either of these so I have no saves. then I reinstall mod with the repair button and it still has same problems. I made sure to install the mod in the "creative assmebly " folder not the activision. I had to do this for barbarian invasion. and I trouble shoted. any suggestions?