Unable To View PDF Preview In Windows 7 Explorer

If you don’t get a preview of your PDF in Windows 7 Explorer, it may be using the wrong PDF document handler.

In Adobe Reader, under Edit > Preferences > General:

At the bottom of page Select Default PDF Handler.

More steps and info here:

http://www.sevenforums.com/general-discussion/35751-cant-preview-pdf-docs-windows-explorer.html