Game keep crashing on startup / SteamAPI_Init failed

[Talaros]

My friend's game is crashing. Reinstalling the game does not help. All drivers are installed. Windows 8.1 (sucks). I hope for your help, because I don't know what the problem is. Here is the error code:

Make sure your game is up-to-date, started correctly and all files are intact.

SteamAPI_Init failed.
> Exception:
SteamAPI_Init failed.
Make sure Steam is running.
Ensure this application runs in the same OS user context as the Steam client.
Check that Superfighters Deluxe is in your Steam library.
> StackTrace:

> FullException:
System.Exception: SteamAPI_Init failed.
Make sure Steam is running.
Ensure this application runs in the same OS user context as the Steam client.
Check that Superfighters Deluxe is in your Steam library.


Additional data
arch:x86, archWOW:AMD64
OS:Microsoft Windows NT 6.2.9200.0

[Gurt]

This error indicates that the SteamAPI_Init function fails, which it can do under a few situations:
The Steam client isn't running. A running Steam client is required to provide implementations of the various Steamworks interfaces.
Your application is not running under the same OS user context as the Steam client, such as a different user or administration access level.
Ensure that you own a license for the App ID on the currently active Steam account. Your game must show up in your Steam library.