Avast! fails to complete. After selecting fixed drives option and starting the scan, I return to find a screen display of the instruction sheet. I close this. The main screen appears. If I check the logfile, there is no entry for this date. The entry for the previous date is 'stopped'. Could my screen saver be aborting the program run? Or could it be that when I "touch any key" to restore my screen, this aborts the protram?