As we know, Win/7 is beyond EOL (end of life) and only Security updates are available. However, there are lots of Optionals and IMO you do well to consider your need for these Optional Updates as we do not know just who much longer they will be available. I have produced a report elsewhere which attempts to explain each Optional Update, what it attempts to provide, and any known side-effect that might be produced. Please excuse the external link, but I don't what to recreate what exists and that is clearly in the interest of the community. The Optional Update Info details are here.