Hello
I before had installed VS 2010 and Now installed SQLManagementStudio_x64_ENU to use Full-Text search, but Full-Text search was gray.
I read https://blogs.msdn.microsoft.com/bethmassi/2011/02/18/step-by-step-installing-sql-server-management-studio-2008-express-after-visual-studio-2010/.
I uninstall SQL Server 2008 from Add or Remove and try to install it again but installation wad not did completely.