What version of the IDE do you have?
It needs to be 1.0.1: http://arduino.googlecode.com/files/arduino-1.0.1-windows.zip
Make sure you are selecting the Drivers folder(see attached image)
What version of the IDE do you have?
It needs to be 1.0.1: http://arduino.googlecode.com/files/arduino-1.0.1-windows.zip
Make sure you are selecting the Drivers folder(see attached image)