I have been looking through your forum for help on the "Authentication Failed" issue.
I install VNC on my W7 Pro machine, change my password to my one and test, all works well.
I then proceed to re-boot the PC and then try the VNC from my other PC again, and get the "Authentication Failed" issue.
I read your previous posts from 2010 about removing ORL' from the registry, I have only installed UVNC, nothing else, not Real VNC or the like.
Setup the Administrator account.
Firewall is Completely disabled.
I have an Inbound FW rule for allowing ports 5900 and 5800, only one these rules are listening.
This has happened on all my W7 machines.
It has never appeared on the old XP Machines I am replacing.
I check the UVNC INI file to see the password is changing, which it is, but it still doesnt work.
Is there something simple I am missing with the install ???