So - as it turns out. this update for O2K7 TOTALLY uninstalled EVERYTHING I had spent HOURS putting into this PC!!
And I DO mean EVERYTHING ... Roxio 2010, AutoDesk ADT2010, Autodesk Revit, NORTON(!!), Acrobat Pro... everything.
It's just like the thing has NEVER had a thing installed (even though the folders for each of these are present inside of "Program Files (x86)".
Well, I'll be damned....

Now THAT'S a 'treat'... I gotta do everything all over again ... !!

Hmmm - just as I was thinking thqt finally MS 'got it right' and my 'issues' with XP and Vista (erg!) were simply a 'bad dream'....

Wake up, guy... the nightmare ain't over yet, it seems...