Q:

ADB No Devices Found

I am attempting to install an Android app on my brand new Nexus 10.  I have a .apk file.  I have downloaded the Android SDK, installed "Android SDK Tools", "Android SDK Platform-tools", and Google USB Driver.  I have checked the setting on my Nexus 10 for "Unknown Sources". 
When I run "adb devices" from the command terminal, it doesn't list any devices.  I attempted to follow this recommendation, because it was identical to a suggestion I had previously found here on Stack Overflow.  After following those steps, "adb devices" still returns an empty list and to make it worse, when I connect my Nexus 10 to my PC, Windows doesn't show any folders within the device. 
I have undone the steps in that link, along with everything else I have done so far, as well as uninstalling my Nexus 10 from Device Manager and reinstalling it, but I am still not seeing any folders in the device. 
Is there anything I am missing to get my device to show up in ADB devices? 
What can I do to get Windows to see the folders within the device? 

A:

Windows 8 wouldn't recognize my Nexus 10 device.  Fixed by Setting the transfer mode to Camera (PTP) through the settings dialogue on the device.  
Settings > Storage > Menu > USB Computer connection to "Camera (PTP)"

A:

For Windows 8 users:
After trying every solution given here, with no success, I found this:
Go to Device Manager

Browse my computer for drivers -> Let me pick from a list of device drivers on my computer
Choose Android Device and then Android ADB Interface. 

Now I have my devices listed at adb devices. 

A:

This situation seems to arise with some ADB drivers.  I have encountered the same thing with a couple of Google devices and installing the Universal ADB windows driver has fixed it for me every time.