Open your registry and find the key mentioned below. 

Create a new DWORD value, or modify the the existing value, named 'StartMenuFavorites'. Modify the value to equal '1' to enable Favorites or '0' to disable them. 

Exit your registry and log off for the changes to take effect. 

Note: By using the same key except under the [HKEY_LOCAL_MACHINE] tree the tweak can be enforced system wide, instead of only user based. 

Key:[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
Value Name: StartMenuFavorites
Data Type: REG_DWORD
Data:0 = disable, 1 = enabled

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