Open Registry Editor and navigate to:
[HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
In the right-pane, set NoSimpleStartMenu to 0 [dword:00000000]
Logoff and login again for the changes to take effect.
Click Start, Run and type GPEDIT.MSC
Double-click User Configuration | Administrative Templates
Click Start menu and Taskbar
Double-click Force classic Start Menu and set it to Not Configured