:: http://sumtips.com/2012/04/reset-windows-7-taskbar-pinned-items-toolbars-jump-lists.html

DEL /F /S /Q /A "%AppData%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\*"
REG DELETE HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband /F
taskkill /f /im explorer.exe
start explorer.exe