If your game is crashing before you even get to the start screen, it's likely your installation is corrupted. You can try these steps to get it working again:

• Verify your game cache. Right-click Rec Room in your Library, go to the Local Files tab, and click "Verify Integrity of Game Cache." Then try to launch the game.
• Reinstall. In the Local Files tab, click "Delete Local Game Content." Once the content has been deleted, reinstall Rec Room.
• Check that your video drivers are up-to-date.
   

Please be aware that if you're playing the game with older Intel integrated graphics, the game may not run properly or at all, which is why your game may be crashing on start-up. See here for more information.