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.
I recommend on using AdwCleaner a few times in a row to make sure that there is nothing left on your computer that may install other trojans, toolbar, etc.