If you are getting an Error 6 or 9 (invalid byte), try this: go to start/Settings/Control Panel and double click the System icon. Click on the Performance tab, then click on the Graphics button near the bottom center of the screen. Under Advanced Graphic Settings, move the Graphics Acceleration slider over one notch to the left--usually to the 3/4 mark (note the original position of the slider in case you want to change it back later). Click OK, then click CLOSE. The computer should ask you to restart--say Yes. After the computer has restarted, open BoxCar and retry.