Thanks. I was experiencing problems with messages claiming inadequate memory, etc, so I decided to revert to a less troublesome desktop earlier in Sept. In the process, I lost some files that I had added after the date I entered. I guess I'm getting this process confused with Windows Restore, which won't lose recent files.
Anyway, a tech at the Apple store told me there should be a way to get these recent files, but he wasn't sure how to do it.
Any suggestions?