I have had the misfortune of supporting users across all common operating systems, the many versions of Windows, Mac OS/X, various Linux distros, etc.
Based on my experience 10% to 20% of computer users shouldn't be given a computer to use. They have absolutely no understanding of the simplest concepts and are totally disinclined to understand. In many cases they are using systems that haven't been updated since they purchased them and have made so many mistakes along the way that their work areas are a mess. For these people, the best recommendation would be to "step away from that computer!".
Based on my experience 10% to 20% of computer users shouldn't be given a computer to use. They have absolutely no understanding of the simplest concepts and are totally disinclined to understand. In many cases they are using systems that haven't been updated since they purchased them and have made so many mistakes along the way that their work areas are a mess. For these people, the best recommendation would be to "step away from that computer!".