It sounds to me like it has slid below the bottom of your monitor.
You can change your video settings so you can see more of your desktop (I can't remember if you need to make it bigger or smaller), then slide the box back up and change the settings back.
Or
In tools(I think) you can reset everything to factory defaults. This does change everything so plan on taking a few extra moments to put it back the way you like it. Sorry I don't have Hoster computer up and running right now or I'd give more precise instructions
Sam
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