I don't get it. "Also, there might an alias called 'Parallels' in the /Library/Preferences directory instead of folder called 'Parallels'. In such case please remove an alias." Does it mean I need to delete the duplicate folder? I don't see any duplicate folder or any directories that name parallels. I did the sudo thing terminal but doesn't work please help. I tried verrifying/reparingthe disk but still it doesn't work.