This thread is excellent at demonstrting how clueless this forum is about electricity. It will be hard for the OP to figure out what to do based on the various answers here.
It appears you have properly measured 80 volts ground to neutral. I would probably check my meter before raising a red flag. Does it read 118 or similar hot to neutral? does it read 118 hot to ground?
One guy suggested not to stick your electrical probed into an outlet. that is what electrical probes are made for and you already have done it. that is how you measure electricity. carry on.
Once you confirm it isn't just a bad meter, do what @erik_squires said. He is one that undertands. if it is real, it is a big deal for a lot of reasons.
Jerry