I thought I had got it all sweetness and light with Net Protect. It all went up in smoke about a week ago, my pc was doing strange things by creating folders and not running programs from the desktop. I did full scans with Net Protect, Malwarebytes and Windows Defender, they all found no problems. Lost the plot after a couple more days of PC playing up. Problem solved by wiping disk then reinstalling everything except Net Protect. PC now running with Avast free doing the anti virus protection. Not had any more problems with PC. Shame about Net Protect not running but that's just a minor setback.