i am tryin to root i am using the nexus root toolkit but i cant install drivers . i have uninstalled according to the tool kit directions . so why is it that if i plug my nexus 7 into my computer in device manager at the very top it say Android device/ andoid composite ADB Interface . isnt that supposed to be deleted and show up when i have a driver installed . and under portable devices is my nexus 7 , witch is correct. so can that be why i cannot install the drivers to root ?