Bridge has stopped showing thumbnails for NEF files

This happened in the past week or so and I do not know what has changed. Other apps are able to show NEF thumbnails. The menu item for Camera Raw Preferences under the Bridge Edit menu is grayed out. I cannot find anyplace else where there might be settings. It is really annoying to not be able to see the thumbnails and makes the app rather useless. I have tried uninstalling and reinstalling Bridge but that did nothing. Cannot find a way to uninstall/reinstall Camera Raw. I am taking a class right now and really need to figure out what is wrong and how to get them back. Hope someone can help. Thanks.