Error Pop-Up When Arduino Icon Clicked

I've got all of the drivers and other stuff installed, but when I click to use the Arduino IDE, it says "Could not find the main class: processing.app.Base. Program will exit." I've installed the latest Java updates, but to no avail.

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I'm using Windows 7 with an UNO. I've got it as a shortcut Icon on my desktop.

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Yes, I tried that 3 times, still, to no avail.