"Julie P." wrote:

The electrical wiring in my house is not grounded, although all the outlets
are three prong. I have a lot of equipment like air conditioners, fax
machines, printers, computers, routers, etc. What would be the easiest way
to ground one or two of my outlets?

Get a decent UPS and plug the computer stuff into it? Mine has
Automatic voltage regulation (AVR) and it is amazing how often it kicks
in.

Weirdly, it is because the voltage increases when a load kicks on.