Lock or Unlock Taskbar
Windows 7
If you do not want the taskbar to be altered, you can lock it. To lock the taskbar, do the following
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Access Taskbar and Start Menu
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Put a check on Lock the taskbar
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Click Apply
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Click OK
To unlock the taskbar, just repeat the steps above but uncheck Lock the taskbar.
You can also Right-click the taskbar and either lock or unlock the taskbar from there.