I had the same thing, I use windows 7 btw.
On your phone:
1) Connect the Nexus 4 to the computer using usb
2) Cancel USB debugging authorization
In windows
1) On Windows, go to your device manager (called MTP for my case)
2) Remove the current driver
3) Reinstall the driver from disk (\ extras \ google \ usb_driver)
Eclipse, , . ,