when you uninstalled the games did you delete teh folders afterwards? when i did this it installed correctly and worked after setting the exe to run as a administrator (this also worked of the sith lords ), have you installed vista service pack one? this actually makes a huge difference to the system, i remember when mine wouldnt run the window would open for the game, the screen would go white and then it would just fail to launch, exiting the game. Trust me just running something as a admin can solve more problems than you think, its one of the things i hate about vista, far to many things to "protect" the user