[ubuntu] 12.04 - Dash Not Displaying Applications?

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http://ubuntuforums.org – Hello all. A few days ago, I noticed that the Dash in Ubuntu 12.04 is not getting any applications I ask it to. For instance, I'll open the Dash by hitting the Windows key. I'll try to search for "Firefox", but it lists Files and Folders. I'll even trying going into the Applications menu, but no applications are being listed. Even when I search for something, like "Calc" for the calculator, nothing comes up. Can anyone tell me why this is happening? (Hardware)