My bluetooth adapter is installed on my Win 7 PC. Device manager finds it and says it working. I goto Nexus 7 and turn ON bluetooth....my PC appears in window. I tell it to pair and it gives me a 6 digit pin...but where do I input this. Nexus is waiting -trying to pair, but nothing happens on PC... and 'computer screen' shows all my drives but not the Nexus. In control panel- under devices- it shows a working adapter.