Refer to my post here-above re disappearance of AVG.

I wish to make the following correction:

A new subdirectory under C:/Prograns has been created with the installation of AVG Free 9.0 but the old subdirectoty for AVG Free Editon was left intact but empty.

I located AVG Free 9.0 in this new directory and was able to start the User Interface from there and do an update after which the AVG icon re-appeared in the system tray.

So, I remain faithfull and thankfull to AVG !!