It is a good idea NOT to install RTW or any TW game in the 'Program Files' folder. Install it into a folder called 'Rome', or make a folder called 'Games' and install it there. Vista views applications in the Program Files folder as applications it has to 'protect'....(from malware, spyware, viruses, etc). This may well be part of the problem people are having installing RTW mods in Vista.....Vista is trying to protect your game (RTW) from the mod you are trying to install. It may also be why updating RTW from the original 1.0 to Patches 1.3 and 1.5 is having spooky results in Vista.