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It looks like the latests Build/Update (22509) and Parallels 17.1.1 fixed the issue. Now i can set de-DE for User and System.

I almost suspect that this problem only occurs with users who do not use en-US automatically (through Parallels installer) or manually. This could also explain why there are not many more error reports here in the forum and in other sources (Reddit etc.). The Parallels (Auto-)installer is...

Yes, also with Secure Boot Enabled.

Found my problem cause: I Installed the German language Pack and set Default to it. Then the Error occurs. Switched Back to en-US everything is fine again. Since you cannot Open Settings you must use Powershell (administrative) to change language back: Set-WinSystemLocale en-US...

That was the case with me, but the next day the problem was back. I also reinstalled today and the problem comes back after every complete shutdown.

I did your solution (disable secure boot) and completely reinstall manually. After this, everything continues to work all day. This morning then started again. Same error again. In the BIOS Secure Boot was enabled again. Unfortunately, only disabling SecureBoot does not help again. I have also...