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.
It is recommeded to use the AdwCleaner twice to make sure that the items are properly removed from your computer. During the scanning procedure, the computer may restart a few times, which is a normal thing.