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Your screenshot shows that the PDF is trying to open in Microsoft Word and Word doesn’t know how to open PDF documents. What’s happened here is that, for whatever reason, Word has become the application that’s associated with the .pdf file extension. We don’t know how that might have

occurred, but it’s easy to fix. Launch Windows Explorer (Win+E) and navigate to a PDF document you want to open. Right-click the document and  choose Properties. In the ‘Open with’ section on the General tab, click the Change button.

If the Adobe Reader icon is displayed in the Recommended Programs panel on the ‘Open with’ dialogue box, click it and then click OK. If not, click Browse and use the ‘Open with’ box to scroll

down to the Reader program folder typically this is