A family of Microsoft word processing software products for creating web, email, and print documents.
By default, a PDF created in Word opens after the conversion, using the default PDF viewer on your system. Is the problem with the conversion or with opening the PDF afterwards? You can check that the file exists in the folder you selected. If the PDF has been successfully created, you likely need to verify or change the default PDF viewer. A starting point is to ensure that Adobe Acrobat Reader (or your favorite PDF viewer) is installed.