Please be sure to back up the web.config file and any custom assemblies before following the below directions.
Run the uninstaller found in the root of the installation directory on the web server.
Or to uninstall manually:
On the web server:
1. Stop the Indexing Service
2. Remove the application from Internet Information Services Manager
3. Delete the bbappfx directory using Windows Explorer
4. Delete the index Catalog for the help files from Computer Management
5. Restart the Indexing Service