How to make sure its not a steam problem (if bought through steam)
Find the games .exe file inside steam, using windows explorer. To launch windows explorer you can use Windows key+E. Look for a folder something like this:
C:\Program files\steam\steamapps\common\Production Line
In whcih you will see ProductionLine.exe
Double click that. If the game runs fione there, but not through steam, this is a steam, issue, not an issue with the game. Try reinstalling, restarting or logging in/out of steam.