@NightWish36 Hi, and welcome to the forum !
I've taken note of your report, and I'm sorry to hear that a launch Issue prevents you from enjoying Assassin's Creed: Valhalla on PC !
In adition to the steps already performed on your end, I invite you to check out our dedicated PC troubleshooting guide.
It helps solve most of the Issues encountered on that platform, with steps such as checking background apps for possible software conflicts, or updating the GPU driver.
Should the problem persist afterwards, or if you have questions, don't hesitate to reach out !