I finally found an old QB 2006 folder buried in a directory as well as some references to the old version in the hive. I wouldn't suggest the everyone go in there because you can easily much things up very very badly.
Having said that, I no longer have any unintended, unrequested QB openings on my PC.
I still like QB; but it was obvious that one of my updates/reinstalls for one version to a later version did not clean up after itself.
