Adobe "Start Your Free Trial" prompt box won't allow me to view pdfs on Mac

[Carrie38756504s90q]

Just recently I can no longer open pdfs on my Mac without the Adobe Reader "start your free trial" prompt box appearing. As soon as I close the prompt box, Adobe closes entirely. I have downloaded the latest updates. The fact that I cannot view pdfs is a sudden change out of nowhere. I do not have an Adobe login.