Just ran through multiple drivers, the one that worked was under portable device in pc system/device manager as nexus 7. I had to disable USB debug in developer options(nexus), uninstall the adb composite driver in device manager -tick the file delete box, then reboot the n7 while still attached with a known good cord.
This was with MTP mode. File manager now works.
I have been using WiFi transfer by setting the PC media folders as shared.
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