disable metro UI with registery editor

first step open cmd or command prompt and write: "regedit" and then search 

HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorer

There in the right pane you will see an option RPEnabled, double click it and change its value from 1 to 0 to revert your preference to the older style windows 7 start menu.

That’s all to it. If you wish to have the new styles back then simply navigate to the key and set the previously modified value to 1 again. Once you revert to the older style menu the new metro ui orb disappears replaced by the older windows logo.