|Oh ... I THINK I may have stumbled around and actually fixed it ...|
I went to the Adobe page (http://kb2.adobe.com/cps/494/cpsid_49419.html) and dowloaded "SubInACL" (per their instructions #2) ... and followed their instructions all the way to the end.
It seems (I've still got my fingers crossed) that it actually installed! For the first time, I got a message that I have FlashPlayer installed.
I'll be back if it doesn't actually work.
A HUGE THANKS to everyone for all their help and suggestions. I'll confirm if it does (or doesn't work).