Before you try to uninstall the product from your computer, you need to remove it from all your browser applications. For Internet Explorer, this can be done by clicking the Tools button (its icon looks like a gear) > Manage Add-ons > Show > All add-ons click the one you want to remove and select Remove. After you did this, go to Start > Control Panel > Programs and features > select Search Protect and click the Uninstall button.
It's advise to use Adware to make sure that all of the leftover files are deleted. If you come across issues in the uninstall process, use Revo Uninstaller. You should be able to force remove any program with this tool.