Thanks,
I tried to start the PC Matic from the Programs file as you instructed, but had the same result. After about a minute's pause with the gears grinding, it offered to install PC Matic as before. This time I opted to install and now it works normally from the desktop icon or from the Program file.
I recall in the installation of the -RT update, there was an uninstall process the occurred automatically. It appeared that it needed to clear the old program in order to install the update. I don't know if this was a glitch in my particular setup, or if this is a problem with