Spybot S&D offers four levels of protection
: immunization, Resident SDHelper, TeaTimer, Hosts file.Immunization
is passive protection, meaning it does not
run in the background. When you "Immunize", entries are added to the system Registry which blocks the storing of cookies from some sites, places a large number of sites in the restricted zone, by domain (site name) and by range (IP address), and blocks the download of selected ActiveX
does the same on a larger scale but places sites in the restricted zone, all by domain (site name). In previous versions Spybot would tell you if SpywareBlaster was installed on your computer that it offered more control over your settings by letting you add and remove sites very easily. If you use Spybot, SpywareBlaster, IE-SPYAD for ZonedOut or other security tools with similar features together, there is some overlap of protection
. Thus, if you undo or disable the protection in one product, it may remove some of the protection installed by the other which means you have to re-immunize or re-enable the protection in each tool as appropriate. IMO, you really don't need to be using both so I would recommend not using Spybot's Immunization.
Further, if you have upgraded your browser to Internet Explorer 8 as Microsoft recommends, the SmartScreen Filter
provides similar but more comprehensive protection by identifying and blocking sites on the web that are distributing malicious software. Read this comment
by a member of the Spybot Advisor Team to see what he has to say about all this.