Eu finalmente encontrei a resposta para o meu próprio problema neste tópico:
Steps
1. Located HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server in registry
2. Right click and go to Permission
3. Click on Advance
4. Tick on both check box (I. Inherit from parent the permission... II. Replace permission entries on all child objects...), click OK
5. Click OK again