no .natvis files found at c:\windows\system32\visualizers.

This error message indicates that Visual Studio cannot find any .natvis files in the directory "c:\windows\system32\visualizers". Natvis files are used by Visual Studio to provide custom visualization of data types while debugging.

To resolve this issue, you can try the following steps:

1. Make sure that you have installed the latest version of Visual Studio and all the updates.

2. Check if there are any .natvis files in the directory "C:\Program Files (x86)\Microsoft Visual Studio\<version>\Common7\Packages\Debugger\Visualizers". If there are no .natvis files in this directory, then you may need to reinstall Visual Studio.

3. If you have custom .natvis files that you want to use, you can place them in a directory and add the path to the "Debugger\Visualizers" property in the Visual Studio Options dialog.

4. Alternatively, you can try copying the .natvis files from another computer where Visual Studio is working fine and paste them in the "c:\windows\system32\visualizers" directory.

If none of these steps work, you may need to contact Microsoft Support for further assistance.