Adobe Photoshop CS5 and Bridge error (parent application not active): Help please!

Can you possibly give me solution to this problem? I used to run Adobe Creative Suite under Windows 7 for quite a while. I seem to have no trouble about it before. But I remember it has only been one time that I encountered an error. It has not really bothered me that time since I was thinking of it to be widespread. But can you please tell me why an error would pop up when I click Edit/Camera Raw Preferences? The error message says “Bridge‘s parent application is not active. Bridge requires that a qualifying product has been launched at least once to enable this feature”. I have tried to right click and double click the image and chose “Open in Camera Raw” but then it still shows the same message. What other option do I have to do to avoid this?
