Got the unit today,opened the box and horror of horrors no instruction book just a disc. Slotted into my pc and a pdf guide appeared. Followed initial instructions then plugged the unit in and "device not found" comes up on screen,further down the guide it states "windows will not recognise the cable in most cases",this is all I need not being good with computers. I honestly thought it would be just like the unit I had for my ford which plugged straight to the car and then reprogrammed it I never once plugged that to my pc. Will phone viezu tomorrow for help but at the moment confused,bewildered and regretting my choice thank goodness theres a 7 day money back return,thats all I can see now.