Thank you so much, but as I said to SimonTuner1...my computer ability is SOOO limited that something as involved as what he described will probably make me mess up the computer.
As to having a techie to do it for me, I searched near me but wasn't able to find one. Two of them told me it's not possible, or the culprit W11 may come back over the W10, and both wanted an exceedingly high fee for such uncertain results.
But thank you and SimonTurner1so much for all the valuable information. :)