Ever installed software for pictures to find that any time that you click on a picture the new software opens automatically and your old preferred software no longer opens? This is because the new software has changed the file associations with the files you want to open and it has made itself the default program.
If you would like to go back to the old program starting up when you click on the same file you need to change your program defaults. The first thing you need to do is go into your Control Panel and click on "Default Programs."
In Default Programs, I suggest you poke around and read all of the cool things you can do. To change the pictures back to the old software you need to click on is "Associate a file type or protocol with a program." You will then see Loading…
Once everything loads, click an extension that you want to change like .jpg or .giff which are common for pictures. Once you click the file, click the button "Change Program" and pick the program you want to use to automatically open the file.