Combing Files Issues saves as Portfolio

Once I hit the combine file button, I'm getting a pop up window showing I need to get Adobe Reader which I believe I already have. Two days ago it would combine and I was able to just save the pdf to my desktop. Now i have to open adobe app and combine from the app. What am I doing wrong? I'd rather select the pdf file, combine and save with having to go to the adobe app. How can I do this?