Disable Metro UI And Get Windows 7 Styled Start Menu Back in Windows 8

1. Type Win + R.
2. Type REGEDIT in the Run dialog.
   
3. Navigate to:
   

   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
   

   
   

   
4. Double-Click on RPEnabled.
5. Type 0 in the Value data box.
   
6. Click OK.
   
7. Logoff and logon again.

Now Metro UI will be disabled and you will get the good old classic UI. To get Metro UI back just type 1 instead of 0 in Step 4.