So you've just installed Windows 7, and decided to go 64 bit because you think one day you'll need more than 4Gb of RAM. Then you fire up Outlook, click on a PDF attachment and you get:
This file cannot be previewed because of an error with the following previewer:
PDF Preview Handler for Vista
To open this file in its own program, double-click it.
What!!! How can my nice shiny new Operating System not understand a PDF!
Anyway, it's an Adobe bug and there are a couple of ways to fix it.. because it's been around for a couple of years and Adobe can't be bothered to!
First you could ditch Adobe as the previewer and use Foxit previewer crafted by Tim Heuer (it's free).
Alternatively you could try this registry fix by Leo Davidson at http://www.pretentiousname.com
I hope this helps you out.. if it does, please click on the ads on this page to show your appreciation.