A family of Microsoft word processing software products for creating web, email, and print documents.
The appearance of smart quotes is language-dependent. Select just the opening quote and click Review | Language | Set Proofing Language and see which language Word thinks that you are using. While you have the Language dialog box open, be sure to clear "Detect language automatically" which would prevent Word from trying to guess the language at the insertion point.
For an existing document where the language is incorrect, you often have to select all the text and manually change the language for the selection. Go to the Language dialog box (as discussed above) and choose the language, and then click OK (do not click Set As Default).