I came across an issue with SSMS not loading properly recently. Regardless of launching from the start menu with or without administrator, SSMS would error out.
Due to this error, I also could not uninstall SSMS to try a repair.
After much trial and error and Google/Bing searches I was able to correct the issue by removing a registry key.
“HKLMSOFTWAREWOW6432NodeMicrosoftMicrosoft SQL Server Management Studio”
Once I removed the registry key, I was able to uninstall and reinstall SSMS.