If you are going to use a modz you should "copy & paste the default game folder (3DXChat) to a new folder called...well anything you like ,,,"Before you install the modz" You then use the new one for the Modz. Always keep a clean version of the game on your computer and use the copy for Modz. Inside the 3DXChat folder is a file called 3dxchat.exe click it and it will run the game thats in its folder.