For this problem I suggest that you try to unsintall the software and then install the latest version of it. In order to uninstall the software you can try to go to Start -> Control Panel -> Add/Remove Programs (Windows XP) or Programs and Features (Windows 7). If this doesn't work, you can try using a third party tool like Revo Uninstaller that will remove the application by force. Additionally, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.
To download the latest version of the software, you can try visiting the following official website.
For more informations about this matter, you can visit the following forum 1 and forum 2.