"In Soviet Russia, game runs you." - Yackov Smirinov

Hmmm... Tough problem, Try this: Goto your Valheim page in your Steam Library. Select the gear icon (on the right), Properties, Local Files (on the left), "Verify integrity of game files..." Let it run.

If this is going to help, it will say something like some files are screwed up and will be replaced. If not It will say that all whatever number of files are spiffy as heck.

If this doesn't work seek help from someone who knows more than I. Let me know how it goes.