i never really nailed down the problem. i ended up completely removing the drivers and reinstalling them from scratch (just the drivers) . still didn't work at first.
i grabbed another older quad, plugged it in and it worked, so then tried the other one i was having issues with and now it worked?????

its only failed to connect once since then. restarted the pc and it was working again.
when it wasn't working it wasn't showing up at all, that anything was connected, in device manager on the pc.
i feel your pain man.
if you've had your fc connected before and all worked correctly and hasn't been damaged, still lights up when you plug it in.
it's something with windows and the drivers. impulse rc driver fixer did nothing for me. it showed everything was correct as matter of fact.
dave