HELP CAN"T INSTALL USB DRIVER FOR MEGA ADK

I am running windows XP professional. I have a brand new mega adk board that I purchased from Radio Shack. On 2 different computers at work, I can't get either to load the USB Drivers.. I have tried both the FTDI Driver and Mega 2560.ini Is there supposed to be a special driver for the ADK board? One computer says that It can't find the file. I made sure that RunOnce was in the Register. Was allready there. Have tried to download the program several times, but still nothing. Don't know what to do? The other computer never comes back from trying to find the drivers? The board has both power and LED on pin 13 ON. But can't get the USB Driver to install? Please any help will be greatly appreciated.

Very bottom of this page: http://arduino.cc/en/Main/ArduinoBoardADK

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