Repairing the Steam service should help you solve this problem in the easiest way possible as it did for other users before you. Also, the problem is sometimes caused by Steam Download servers being down so consider switching to a new one. Other possible culprits include having disabled DEP (Data Execution Prevention) on your computer meaning you might need to enable it.
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Also, your computer’s old network drivers may be preventing the VAC service from operating normally and you should consider updating them. Sometimes the error is caused by a broken or stopped Steam Client Service and the service either needs to be repaired or restarted. There are many registered causes for the problem. What Cases the Valve Authentication Error The game will disconnect you and possibly ban you from servers because of this error so make sure you follow the article in order to solve the problem as soon as possible. Plenty of users have had to deal with this problem and their gaming experience becomes pretty much ruined. However, sometimes it’s this software which disconnects you from Valve games simply because of an “authentication error”. Valve Anti-Cheat is a software used by Valve games to check your setup to see if you are using any hack or third-party program which might make your gaming experience easier or give you an unfair advantage over other players.