I don't know the difference between "mini chat" and "full chat" (they look rather same to me), but for the sake of clarity, I right-clicked the connection and called "chat" mode, then minimized the chat window.
I am sorry for not making it clear. The mini-chat is just an extension to the regular chat mode that you ran. Mini-chat looks like a panel at the right hand side of the Full Control window. It allows you to chat during a remote session without switching to the dedicated chat window. Here is more about the mini chat.
EAV'd again in most generic of all circumstances. Simple attempt to connect to a remote system, auth is from the same domain the remote is a member of. No other domain controllers online.
I think that it is time that we suggest having a remote session and helping you out directly. Unfortunately, there are no other ideas why this might be happening and we need to see your setup with our own eyes.
If this is an option for you, please let us know at email@example.com and we will discuss the details.
1. Add the Host installer to your antivirus software exceptions list. Specifically, add two folders to the exceptions: the folder where you downloaded the installer (I also recommend that you re-download the file) and the target folder "C:\Program Files (x86)\Remote Utilities - Host". The latter may not be created yet, just add it manually to your a/v exceptions.
3. You may also check the Microsoft Fixit tool in case you cannot get rid of your previous installation.
Once you complete the steps above, restart your computer and try installing again. Make sure that the Windows account has full administrative privileges because they are required when installing the Host (it runs as a system service after the installation).