Hi PeterJ,
unfortunately this has not fixed the problem with printer(works)/scanner(no).
Now I'll try to remove all HPware around, included HP assistant (not visible in pcontrol/programs, have to found a way) and HP netframework, drivers, printui, etc.
finally reinstall driver an test.
After that I'll check red messages in event viewer and will be back to you in case possible check
which worth the effort to try to fix, or is possible live with them, instead.
I've left around some logs of wiatrace (mine and one of my wife's pc that suffered same problem, but after some months
her pc repaired itself don't know how).
Meanwhile, if you have any suggestion, especially for WIA issue (exist some specific tool?), it's welcome of course.