Hi Folks,
good news, at least for me. Issue solved.
I just tried to uninstall Smart Security where a window saying "collecting data" appeared during the uninstall process. Nothing weird so far, nevertheless I noted that it took too long to finish the step. So I saw that my connected external USB hard drive was being continously accessed indicating that SS is "collecting data/info" in there, maybe. What the hell is SS collecting on external drive to finish the uninstall process?!.
So I decided to abort the whole procedure by clicking Cancel in which SS after a coupled minutes doesn't responded anymore. So I pulled off the cable from the usb port while hard drive was blinking.
Suddenly, the uninstall process took back its course and aborted the uninstall. I then run the SS again and voilà! I got it back working again AND without the annoying red warning on the GUI -- the PC also got its performance back.
So what I can conclude so far is that in my case the external drive got stuck somehow and interfered SS from functioning properly.