Why Two AVGUI.Exe In Task Manager After Updating ?

>As a further question why does task manager show "AVG Internet Security System"
>when the only product I have installed is "AVG free antivirus".

I'm not sure you should be too concerned about the name shown in task manager,
as the core elements of protection and the GUI are the same for the AV and
IS products. Before this recent update - which I have *not* applied yet - the
Task Manager shows "AVG Antivirus" on my system although I have AVG Internet
Security installed.

I suspect TM is using the "File description" from the file's properties.
The "Product name" property may be different. e.g. - On my system the
"File description" is "AVG Antivirus" but the "Product name" is
"AVG Internet Security System".

As to multiple AVGUI.exe tasks running - that's normal under some conditions.
That is the part of the product that handles the user interface. (GUI)

There is always at least one showing as that is the resident part of the program.
If you open the GUI there will be a second instance showing in the TM. The same
if you open the widget.

If you open the GUI and minimize it to the task manager, then open the widget as
well, you will see three instances of AVGUI.exe in the TM. That is normal
behaviour for many applications. e.g. - Firefox and Chrome will spawn many
tasks with the same name every time they are run.

Granted it's a little puzzling that it should spawn an instance just as a
result of running a browser. But I seriously doubt that your protection is
adversely affected in any way. Testing it at amtso.org may ease your
apprehensions somewhat.