Can't open any forms

Since I installed DC, I can't open ANY forms I created in the previous version. These are not forms created in some ancient form of adobe. They are forms I created in the previous version of Acrobat Pro. When I try to open a form to make an additional change, or even just to print the form, it hangs and crashes. I have no clue how to fix this, and really don't want to redo any of my longer documents. Help!