Little Mac,
Disabled NAV and tried to re-install. Same thing happened. Install appears to go just fine. After reboot I get the message box that install has failed and the same error messages on the inability to access the HKCUs occured.
Another interesting thing... Instead of acknowledging the message box on the failed install, i first went to the tray icon and right clicked it this time. It brought up the configuration interface, but it was unresponsive to button clicks and didn't keep any inputs made. Just one more clue!?

I think next I may just start disabling any/all background processes til I find a smoking gun...or not!
Thanks for your thoughs and any others you may get on my problem! I'm all ears!!
Cheers, Jeff