Windows Data Execution Prevention (DEP) is a security feature that sometimes kills older Steam games on sight.
Completely close Steam (check your System Tray to ensure it is off). Restart your computer. Launch Steam and let it check for updates. Log in and try launching the game again. Disable "Steam Input" hitman absolution failed to initialize steam fix
Are you using any like Avast, McAfee, or Bitdefender? Windows Data Execution Prevention (DEP) is a security