El .net sdk principal no puede ser localizado.

el .net sdk principal no se encuentra la unidad

1 - You have to make sure visual code is closed.
2 - Download these 2 installation from official website:
Download Link (.NET): https://dotnet.microsoft.com/en-us/download/dotnet
Download Link (.NET Framework): https://dotnet.microsoft.com/en-us/download/dotnet-framework/net471
3 - Make sure again that visual code is closed -> install both files-> run VSCode.