If all else fails, you can simply run the game as an administrator to get around launch issues and crashing problems. If it loads but the game crashes at the opening screen, then you could be having issues with the Steam overlay. If some of the game system files have been damaged, this should fix the problem.
![all steam games crash on launch all steam games crash on launch](https://images.drivereasy.com/wp-content/uploads/2019/12/Driver-Easy-Scan-screen.jpg)
Instead of re-installing, you can try and repair them by verifying the integrity of game files. If the previous method didn't fix Valheim, then your game files may be corrupt.
![all steam games crash on launch all steam games crash on launch](https://cdn.segmentnext.com/wp-content/uploads/2019/03/ZFAu2eA4WyR7RU2EvdT8M-e1553873244389.jpg)
If the problem persists, then follow the steps below. These simple steps are essential before launching any game, not just Valheim. It's also worth making sure your anti virus software isn't blocking the game.
ALL STEAM GAMES CRASH ON LAUNCH UPDATE
Before trying out all the methods listed below, be sure to update Windows and your graphics card/video card drivers.