but XP would only invoke Plug and Play if any USB devices were plugged in.
Are any USB devices plugged in?
When my XP Pro boots up, what I think is some kind of automated PnP searches for new devices. It finds three printers I do not have and installs them. It makes one of them the default printer. I cannot change the default printer without deleting it. But of course when I boot again, it reinstalls the printer and makes it the default.
How do I turn off this auto search and install?
I searched in Help on my system and only found how to turn on auto search. I backtracked the help and I only found indications that it was not turned on.