I have seen soooooo... many suggestions.
If your concern is that when you have installed or updated your Windows Live Mail progam and now you find that many new messages require "show" images.
While for your safety, many people do not like to find the pages of a familiar site filled with Red X's.
If you just want that nuisance task to go away:
With Mail open and in your inbox:
In the menu bar (you know, File, Edit, View, TOOLS, etc) click Tools, then SAFETY Options, Security Tab.
About midlist, you will see "Download".
You most likely will see the box "block images" checked.
Uncheck the box (boxes).
That should be your fix for the problem. If you wish to change back to the default, just reverse the steps.
BTW -This description is using XP and Version 6 of Mail. If you are using a different OS or Version, be patient and look for the same generic descriptions.