Win7 left taskbar is missing, what to do

  
Press win+r, run gpedit.msc, go to “local group policy editor”
on the left side"user configuration”--->"management template"--->" Start menu and taskbar "Step by step
to the 20th left and right option in the right menu “ The quick launch bar is displayed in the taskbar. Double-click ---> Check “Enabled”, OK.

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