Error when opening Server Manager MMC snap-in

If you are getting {18ea3f92-d6aa-41d9-a205-2023400c8fbb} when trying to open Server Manager on Windows Server 2008. Go to C:\Windows\Microsoft.NET\Framework64\v2.0.50727\CONFIG folder > rename current machine.config file > make copy of current.machine.default file > rename it to machine.config