To uninstall this software you can try using the Windows Uninstaller. To do that, you can go to Start -> Control Panel -> Programs and Features (for Windows 7) or Add/Remove Programs (for Windows XP) -> select the program and hit uninstall.
Also, you can 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.