PDF Preview Handler doesn't work

Hi, I got this error in the e-mail window:

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.

No more error details are provided.
Windows Vista x64 + Outlook 2007.
I tried reinstalling 8.1 update, no success.
Any clue?