What do you know about that. Microsoft didn't tell us where you obtain the Windows 11 Media Creation Tool and learn of its use that you can run it from the flash drive by simply clicking on the setup file; you don't have to boot up from the flash drive at all. I don't know how many times I went round and round with that thing getting it to run that way.
And what makes this worse for me is that this didn't fix the problem at all; namely, that WSearch won't start. I get error codes 2 and 5. Indexing won't run. I've done everything I can find online to fix that, some several times, and I finally resorted to this repair operation.
So I'm back at square 1. I'll just have to live with slow searches in Explorer.