This comprehensive guide covers the root causes of this error and provides step-by-step solutions to get your games running smoothly again. Common Causes of the Error
Since Steam uses online authentication, ensure you have a stable internet connection. Try switching from Wi-Fi to Ethernet if possible.
Add the game's installation folder to your antivirus to prevent it from happening again. 2. Verify Integrity of Game Files (Official Steam Games)
Before trying any fix below, check your Antivirus software (Windows Defender, Avast, Norton, etc.).
: To prevent it from happening again, go to your antivirus settings and add the game’s installation folder as an Exclusion or Allowed folder . Advanced Solutions
Add the entire game folder to your antivirus to prevent the software from deleting it again. 2. Verify Integrity of Game Files (Steam Users)
Your Steam application is outdated and causing compatibility issues with newer game updates.