The issue may stem from using mods that are no longer compatible with the latest version of the game.

Sometimes it may also be connected to broken or missing .dll files.

If the msvcr100 file is missing, download Visual Studio 2010 (VC++ 10.0) at

If the msvcr110 is missing, download Visual Studio 2012 (VC++ 11.0) at

Additionally, try logging out of Steam and sign back in.

Unplug any external devices, such as a camera, from your USB ports, please. See if the game launches correctly after that. In addition, try downgrading your video driver version to an older one.

Also, make sure your PC meets the game's minimum system requirements, please.

Some types of software and processes on computers are likewise known to be conflicting with games and Steam. Visit Steam's FAQ on interfering programs, please. As suggested by Valve, "even if you do not find any programs that might be causing an issue, please verify your game files and try running the game again".

If you've tried all of the above and it still doesn't work, send us a message in accordance with the following article: How to send us a message?