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I HAVE THE VGN-NR11Z/S AND THE LAST DAYS THE TASKBAR SUDDENLY DISAPPEARS WITHOUT A REASON AND I CAN DO NOTHING TO MAKE IT REAPPEAR EXCEPT FROM RESTARTING MY COMPUTER. DOES ANYONE KNOW ANYTHING??
Try pressing the windows button, left hand side of your keyboard, if the task bar appears-
right-click the task bar, click Properties, and then, on the Taskbar tab, clear the Auto-hide the taskbar check box, click apply, then OK.
If that does solve the task bar problem then try a system restore to a point before the problem appeared.
http://www.bleepingcomputer.com/tutorials/tutorial143.html#restore