On Friday, April 6, 2018 at 10:08:47 PM UTC+8, Paul wrote:

Do you have an exact copy of the error message ?
You could try popping that into Google and see
what others have run into.

Paul

I did find something that registry keys weren't deleted because they were
write locked. So one has to go and search for those keys and unprotect them.
But what names those keys are? That is another mystery.
What a useless company. I know imperfect uninstallers are pretty common,
but then they issue a "cleanup" tool to finish the job, and that doesn't
solve the problem.