Right, unistall PC suite, uninstall the DKU drivers, unplug the cable, go to device manager and then make sure the usb cable with the explanation mark is not there.
Download the latest version of Nokia PC suite from here
http://www.nokia.com/nokia/0,,72014,00.html.
Restart the computer.
Run the DKU 2 setup file downloaded from here
http://www.mobymemory.com/Content/HO...ivers.469.html
then re-start the pc.
Check it in device manager, if there's still an issue with the drivers then i'd suggest getting a new cable off e-bay. Or a bluetooth dongle off
www.ebuyer.com