Open the PDF file in Adobe Acrobat, not Adobe Reader.
I have an open PDF file in Adobe Acrobat Pro XI?
I don't know if this is a Reader or not - I thought I
when I bought this product that I was getting Acrobat - period!!!
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If you have bought Adobe Acrobat then you will have the Save As Other > Microsoft Word menu item, and there's no charge to use it.
If you are still opening your files in Adobe Reader, then it will be trying to sell you a subscription to the ExportPDF online service. You don't need that if you have Acrobat installed.