Error code 83 appears when Steam cannot launch a game, either because the game files are damaged, security software is blocking the game, or Windows and driver components are out of date. It shows up as “Game failed to start (error code 83)” and can affect one game or several.
The fix, in order
Restart the PC and try the game again. A temporary glitch in Steam or Windows is the quickest cause to rule out.
Verify the integrity of game files. In the Library, right-click the game, open Properties, then Installed Files, and click Verify integrity of game files.
Install Windows updates. Open Settings, then Windows Update, and install any pending updates, then restart the PC.
Update the graphics driver from the card maker, NVIDIA, AMD, or Intel, and restart the PC after the install.
Allow Steam and the game through the firewall. In Windows Security, open Firewall and network protection, then Allow an app through firewall, and tick Steam and the game for private and public networks.
Check the antivirus. Add the Steam folder and the game folder to the antivirus exclusions, or test with real-time protection paused briefly to see if the block is the cause.
Reinstall the game if the error follows one title only. A fresh install replaces files that verification could not repair.
If it still happens
If the error appears for every game, clear the Steam download cache under Settings, Downloads, then restart Steam, and check whether Steam itself needs an update under Steam, Check for Steam Client Updates. A client reinstall is the last step.
Common questions
Is error 83 caused by my account? Almost never. It is a launch problem on the PC, not an account problem. Account issues show up as sign-in or purchase messages, not launch codes.
Can antivirus really cause error 83? Yes, it is one of the most reported causes. Security software can block a game executable from starting, and the game then fails with code 83. Adding an exclusion for the Steam folder is the lasting fix.