When the license of our home desktop's anti-virus expired in 2015, we installed AVG, a free anti-virus downloadable from the internet. Quite okay except that the software updates itself every booting even if the setting is in manual and not in auto update. A few months ago, we installed Avast in place of AVG. It's okay with the update because it doesn't update itself with the manual setting. However, last week when we were uploading the camera, the camera's software wouldn't continue. It's a good thing that we suspected the anti-virus and we were correct. Avast was preventing the camera software from running. So now we are back with AVG.