And clicking on Yes to remove it, doesn’t help. This is actually a permission issue from Vista and Windows 7 and up.
The service pack update to Windows Vista has been known to change permissions to the registry in a way that prevents user access to the information about installed classes: HKEY_CLASSES_ROOT. This prevents SQL Server Management Studio from loading the add-ins into the environment.
To correct this problem, it's necessary to assign permissions to the registry for the logged-in user.
- First open the Registry Editor (regedit.exe) using the "Run As Administrator" option.
- Right-click HKEY_CLASSES_ROOT and select "Permissions", and give the logged-in user full control.
- The following permissions needed to be added to HKEY_CLASSES_ROOT as well:
-System: full control
-CREATOR OWNER: full control on subkeys only