Help with restoring deleted Libraries Navigation Pane

OS: Windows7
I accidentally deleted the Libraries drop down menu in my Windows Explorer’s Navigation pane [the one on the left], how do I get it back? I can access Libraries [Music, Video, My Documents, Pictures] like normal by clicking Windows Explorer’s taskbar icon, but I can’t restore its deleted navigation pane, only add a LIbraries shortcut to other navigation panes.

Please help