Welcome to the forums.
Just because you are running SP1 on W7, doesn't mean that it should install. The instructions state that you need additional windows updates also.
Find the minimum system requirements, supported hardware, and languages for the Visual Studio 2019 product family.
I suggest updating your w7 OS to the latest updates provided by windows updates.
If that doesn't work, I assume you might have a bug in your certificate signing service. There is a fix for that too, but lets see if windows updates resolves your issue.