If you have created a Mod through the 'Create A Mod' wizard, see the following page on Resetting a Custom Mod Game Configuration. Click Reset to reset your game configurations to the defaults.Choose Reset Game Configurations from the Source SDK window.Open the Source SDK application from the Steam Window, under the Tools section.Shut down any Source SDK Tools, such as Hammer or FacePoser.If you have not created a custom Mod through the 'Create A Mod' wizard: If you're experiencing problems with the Hammer game configuration or SDK Launcher game configuration not behaving correctly, you can follow this procedure to reset the game configurations to the default state.