What are you clicking on when Windows Photo Viewer opens instead of Premiere Elements 13....
a. The desktop icon for Premiere Elements 13
b. Premiere Elements 13 project file which has the file extension of .prel?
If b...the go to Control Panel/Default Programs and Associate a file type or protocol with a specific program and change the .prel choice
to Premiere Elements 13.
Please let us know if that works for you. If not, please give more details.