Hi Peter,
Have you tried repairing your Visual Studio in Visual Studio Installer? Then, try to launch your VS2019 in safe mode and check if the error disappears.
By the way, I am afraid that the picture you provided is not very clear. For further investigate, could you tell us this error with English?
You can also share us some related installation logs. Please download and run this collect.exe tool, go to %temp% folder and find the vslogs.zip file, upload it to https://onedrive.live.com/ and share the link here. Thanks for your understanding.
Sincerely,
Anna