CloudNine is a game that uses InstallShield. In order to uninstall it, you need to rename the InstallShield folder. Go to Start > My Computer > Local Disk (C:) > Program Files > Common Files > InstallShield, right-click on the folder and select Rename. Rename the folder from InstallShield to InstallShield.old and uninstall the application via Add or Remove Programs feature.
If this doesn't work, try using Revo Uninstaller. Even if it can't uninstall the application normally, it will force it to uninstall by wiping out all traces of its presence from the system.
After that, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.