I fixed the BFE issue. That and my Firewall are restored.
The background is part of the "Themes" you can get off of Windows website. I only use the ones THEY put out.
That's why it's changed. It periodically changes the background on it's own.
As for Firefox, the other day when I tried opening it it said it had to "Refresh" because it noticed it had been running slowly or was slow to open. It pretty much wiped everything out and put me back to basics. But it did save my favorites and stuff like that. Anyway, I guess that can't really be considered a fresh install. Maybe I'll have to try that next. But I don't want to lose my favorites and stuff like that.