Hi Ronda,
Thanks for reaching out. I understand how frustrating it can be when PDF files won’t open directly from File Explorer. I'm here to help!
First, ensure your PDF files are associated with the correct application. Sometimes Windows defaults to another app like Edge. Right-click any PDF, choose Open with, select Adobe Acrobat Reader, and check Always use this app. This ensures every PDF opens with Adobe going forward.
Second, if that doesn’t help, repair or reinstall Adobe Reader from Control Panel → Programs & Features. A fresh install often resolves this kind of issue.
Third, confirm the file isn’t blocked by Windows. Right-click the PDF, go to Properties, and click Unblock if available.
Last, if the problem persists, try opening a PDF from a shorter path or test another viewer like Foxit to rule out system issues.
I hope you find this information helpful. Please let me know if you have any further questions If the answer is helpful, please click "Accept Answer".
Regards,
Carlo