[BS8th_Jaw]

It sounds like you guys might possibly be running into some sort of anti crack software. I know most games when bought and downloaded from internet sites use certain measures to ensure that people won't start distributing the stuff once they get it (similar to what the boxed versions use).

Anyone ever hear of starforce? You might want to check into this possibility... because if there is one with it - it will effectively force the game to not work if its data files are changed