ADB can’t find your new Nexus 7 2nd gen?

Most likely you just lack the google USB driver for it, like I did and the solution is pretty easy and simple:

Download the driver from HERE and use THIS guide how to install it. And you will have it up and running in no time. Have windows 8 myself, but it’s pretty much the same.

Look at this if you want to find a simpler way to install ADB and Fastboot tools.