So I plugged my phone into my pc for the first time.. and it started downloading the driver.. then I get a phone call and I instinctively unplugged the phone to answer it.. great.. the driver wasn't finished.. now when I plug the phone up, it tries to install the driver... it recognizes it.. but then it stalls out and says either use the disk or "waiting for user input ADB"... how do I undo the mess I made? thanks