Use Word as your (slow) default PDF viewer
Problem: If you double-click on a PDF file in Windows 8, you get hurled over to the Metro side and stuck in the full-screen Metro Reader app. It’s totally preventable if you have Word 2013. The new Word has a slow but almost always serviceable PDF viewing capability. There’s no reason to use Acrobat Reader or Foxit, although you may want to keep one around for the unusual PDF file that doesn’t render right in Word 2013, or really big PDFs, which take glacial time to render in Word.
Solution: In Windows Explorer or File Explorer, right-click on a PDF file. Choose Open With, Choose Default Program. Pick Word (desktop). Violà.