Solution to CS 1.6 Failed to Initialize Authentication Interface Error
To fix the CS 1.6 failed to initialize authentication interace error you have to delete the registry files associated with Valve in the Hkey_Current_User and the Hkey_Local_Machine directories and restart Steam. If that doesn't work, verify the integrity of your game files or cache.
You need to delete these Valve folders in the Registry Editor or regedit:
Hkey_Current_User\software\valve\
Hkey_Local_Machine\software\valve\
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