I just reinstalled Visual Studio 2019, and I am still getting same error.
Following is the output from build, and the application is the Console Application, that by default prints "Hello World".
Build started...
1>------ Build started: Project: ConsoleApplication1, Configuration: Debug Win32 ------
1>Program
1>c1xx : fatal error C1083: Cannot open source file: 'C:\Program': No such file or directory
1>Files
1>c1xx : fatal error C1083: Cannot open source file: 'Files': No such file or directory
1>Microsoft
1>c1xx : fatal error C1083: Cannot open source file: '(x86)\Microsoft': No such file or directory
1>Visual
1>c1xx : fatal error C1083: Cannot open source file: 'Visual': No such file or directory
1>bin
1>c1xx : fatal error C1083: Cannot open source file: 'Studio\2019\Professional\VC\Tools\Llvm\bin': No such file or directory
1>ConsoleApplication1.cpp
1>Generating Code...
1>Done building project "ConsoleApplication1.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========