I have installed TightVNC to a Windows host just a few weeks ago in order to be able to manage remotely a Windows host and forgot to write down the administrator password 🙂 (stoopid!)
I had to explain to a friend remotely how to change the TightVNC admin password and it was a complete nightmare!
Shortly here is the exact menus one who wants to reset the password of a TigthVNC server after forgotten:
Start -> All Programs -> TightVNC
-> TightVNC Server (Service Mode) ->
TightVNC Service - Offline Configuration.
In the configuration dialog to popup there are the Server and Administration tabs through which a new password can be set.
After the password is change either a restart of the TightVNC server is necessery or a restart of the Windows PC.