Sometimes, an installation corruption can occur, which causes the game to not work correctly.
The order to verify your game files, please follow these steps:
- Restart your computer and launch Steam
- Enter The Medium's page and select Manage > Properties.
- Select the Local files tab and click the Verify integrity of game files... button.
- Steam will verify the game's files - this process may take several minutes.
If the above doesn't help, try updating your graphic's drivers - find the detailed steps here.