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4. Plug in your Netduino's usb cable back into your pc. At this point for me, windows vista searched automatically for a driver and found the right one for a virtual serial port. If yours does not do this, you may need to point to the driver file in the Program Files > Atmel SAM-BA > Drivers directory.
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Could it be that Atmel has no drivers for Windows XP 64-bit? Or any 64-bit OS for that matter?
Because when I try to manually point it to that directory, Windows XP 64-bit says that it "couldn't find the necessary software. make sure that the driver works with x64-based systems."
Is there any other driver I could install maybe? Because, it sounds like the COM port over USB could be something generic.