Resident SDHelper is a second layer of protection for Internet Explorer. The immunize function blocks installers by their ActiveX ID, whereas SDHelper blocks badware that tries to enter using a different method. Thus Internet Explorer cannot download bad files. You start SDHelper by clicking on Tools → Resident on the left navigation bar (therefore Spybot-S&D has to run in Advanced Mode). There you can tick the checkboxes next to Resident “SDHelper” (Internet Explorer bad download blocker) active in order to activate SDHelper.
Spybot is maintained by a team of people very dedicated to privacy issues, many of which are working full-time on analysing masses of new threats each week, and the response time from our support team is better than that of many a commercial vendor. We would appreciate it if you would honour our efforts with a moderate donation.