If you use OneNote for most of the things and are a heavy user, Microsoft OneNote Search Connector is what you should use when searching for a document image or text inside OneNote. If you had installed OneNote correctly, Microsoft OneNote Search Connector should be listed under C:Users<username>Searches
This search connector is another example of Federated search in Windows 7 Like there is for Flickr and Bing.In case the search is not working for you its most probably because of improper DLL registration so I would suggest you to repair.
