Step 2: In the Registry Editor, navigate to the following key:
HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorer
Step 3: In the right pane, double-click on the entry named RPEnabled and change its value from 1 to 0 to enable the good old Start menu back in Windows 8.
That’s it.
To disable the old Start menu, simply change the value of RPEnabled key to 1.
Note that when you enable the old Start menu, the new Metro Start button goes invisible. That is, the old Start orb replaces the new Metro Start button.
Source: Into Windows
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