Bridge CS4 not recognizing tiff files

I downloaded an update for camera raw and installed in manually and after this I couldn't open Photoshop.  I then uninstalled and reinstalled CS4 and now bridge will show thumbnails of tiff files but won't open large.  All I see is a generic icon.  How do I get bridge to recognize tiff files.  It recognizes jpgs, and raw files.  I'm using Windows Vista.

Any help appreciated

Suzan