At this point I'd check out the processes running (accessible from the Task Manager, Ctrl+Alt+Del to open) and see is there were any odd ones. Then I'd forcibly stop them and see which one caused the icon to disappear - if you know what it's called, you can tell if it is legitimate or not.
Unfortunately, there's no way of knowing what it'll be called. Maybe take a screenshot of running processes (can't remember if you hold down Alt, Shift or Ctrl while pressing Print Screen to capture only the active window) and post it. Sorry, I stopped using Windows almost two years ago, I'm getting rusty.
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