We can add directly without uninstalling only which we have missed by Visual Studio installer. If we missed installing in Visual Studio we need not uninstall and again install. Suggest a feature, track product issues, and find answers in the Visual Studio Developer Community. We can repair and uninstall visual studio 2017 using Visual Studio installer.If you're an IT Administrator and don't have Visual Studio installed, you can submit IT Admin feedback here. Report product issues to us via the Report a Problem tool that appears both in the Visual Studio Installer and in the Visual Studio IDE.We also offer an installation chat (English only) support option for installation-related issues.If your Visual Studio installation fails, see Troubleshoot Visual Studio installation and upgrade issues for step-by-step guidance. There is no 'Visual Studio 2015' in Add or Remove Programs (as it is not in the new registry). Now, when I start it, it tells me to reinstall it. If you do not see the Repair option in the More dropdown menu, chances are you're in the Available tab instead of the Installed tab of the Visual Studio Installer. I installed Visual Studio on D: drive which remained intact.
HOW TO REPAIR VISUAL STUDIO WITHOUT REINSTALLING INSTALL
To prevent this issue, download and install each file, one at a time. Create a short 'hello world' program in C, compile and link it using the CL.
To test what you have, here is one way: open the Visual Studio C++ command window from the Start menu. Without the C/C++ components, Intel Fortran will not work. The Repair option applies to installed instances of Visual Studio. Take care not to overwrite a previous downloaded file before installing it. When you installed Visual Studio, did you select the 'optional' C++ package This is deselected by default.