text: i'm working with adult with learning difficulties too, i will recommend that you by a PC with a touching screen, it's much easier to use than a mouse.  this is a link about what the screen can do, for the PC itself, it will depend what is your need , what  kind of work does the person need o do on it . http://www.allcam.biz/catalog/product_info.php?ref=12&products_id=99