Modifying registry

I noticed Spyware Blaster loads numerous web addresses into the registry under Internet Settings under P3P and Domains. Please explain the need for this action.

 

Basically it adds sites to the Restricted Sites Zone(Domains) to help prevent the installation of spyware and other potentially unwanted software. It also adds URL entries to the P3P location you mentioned to help block "cookies that may be used to track your activities, build a profile about your habits, collect information, or uniquely identify you to advertisers."

Those above mentioned entries are added to the same location a user of Internet Explorer would add them manually if they so desired.

Bubba