Nexus 7 (2013) and Win 7 64 - cannot install USB driver despite checking many forums and online resources
Don´t use USB3.0 ports ... try it on a usb 2.0 port
Also try to change transfer mode, like suggested here:https://android.stackexchange.com/a/49662
cracked it after 2 hours...
- download this usb driver:http://dlcdnet.asus.com/pub/ASUS/EeePAD/nexus7/usb_driver_r06_windows.zip
2.go to the device manager , right click the nexus device and choose properties, choose "hardware" and then choose update your driver , choose manualy and pick the folder you opend the zip file to and press apply.
3.open your setting in nexus . go to : "about the device" , at to the bottom of the page and press it strong text7 times .
4.open the developers menu and enable debug with usb.
5.finally press storage from the setting menu and click the menu that apears at the top left corner.press the connect usb to the computer, choose the second option (PTP).
one more thing: if that doesn't work restart your computer
that should do the trick , they couldn't make it more simple than that...
You can do this go to Settings > Storage, clicking on the setting menu icon in the top right hand corner and selecting "USB computer connection". I then changed the storage mode to "Camera (PTP)". Done try re installing the driver from device manager.