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in my opinion use Registry Editor then select CURRENT USER after that go to software you will find Valve click on it and select half life so what you wanna do is pretty much delete those files put them on the trash can you dont need to uninstall steam and you gonna have to do again is to install Cs 1.6 and if that does not work make a post again
Registry Editor ---> CURRENT-USER ---> SOFTWARE ---> VALVE ---> HALF-LIFE ---> DELETE FILES (ANYTHING THAT IS INSIDE THE FILES) (Cs will be uninstall AUTOMATIC) (Just Install Cs again if it causes the same problem make a post we will find a solucion) (that happend to me twice 2 years ago)
Registry Editor ---> CURRENT-USER ---> SOFTWARE ---> VALVE ---> HALF-LIFE ---> DELETE FILES (ANYTHING THAT IS INSIDE THE FILES) (Cs will be uninstall AUTOMATIC) (Just Install Cs again if it causes the same problem make a post we will find a solucion) (that happend to me twice 2 years ago)
Ex Corrupto admin #1