From version 1.2, Spybot-S&D has had a feature to allow you to immunize your computer against certain pieces of spyware. It also allows you to use native browser settings to block cookies, malware installations, bad websites and other threats.
SDHelper is an Internet Explorer plugin that adds a second layer for blocking threats.
For more information please check the TeaTimer FAQ entry.
FAQ Category: 1.6 only, General Questions