Today while working on SQL Server configuration I faced this strange error.
I was running as administrator and I know SQL Server was running. Later I found a Microsoft KB article related to this issue. This issue is because “On a 64-bit computer, you install an instance of the 32-bit (x86-based) version of Microsoft SQL Server. On the same computer, you install an instance of the 64-bit version of SQL Server 2008. If you then uninstall the 64-bit instance, you receive the following error message when you open SQL Server Configuration Manager”
As a workaround Microsoft suggest to run the following command.