Hallo,ich kann photoshop nicht mehr starten

your cpu is incompatible with ps 2021, Known issues in Photoshop (adobe.com)

to use that ps version, install on a different computer.

That may be a Microsoft problem... Go to the Search bar at the top of http://www.microsoft.com/en-us/ to find and re-install the C runtime, or for ALL Windows help
-or direct to https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads
https://helpx.adobe.com/x-productkb/global/troubleshoot-c-runtime-errors-products.html