I recommend uninstalling the software from the Control Panel using Uninstall a program. If you keep receiving errors, then 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. If the application is persistent, AdwCleaner will make sure to disable all its services, registry keys, etc.