I have done the obvious -- the USB driver was installed from the latest Android SDK, and USB debugging was turned on in the tablet.
When the Nexus 7 is connecte
In my case I had two problems:
My PC got a previous "Samsung Galaxy II" driver and assigned it to my Nexus 7. I needed uninstall it many times. Finally I could bind the correct Nexus 7 driver.
The need to set the PTP option.