techs,
yes, the fix you suggest will work... because it removes all immunization (IE restricted sites)
as well as all trusted sites --- because Microsoft, in its infinite wisdom, decided to store both the bad/restricted and the good/trusted in the same ZoneMap registry location.
Most people are not comfortable editing the registry. UNDOing immunization within Spybot (and within SpywareBlaster, for those who use it), is safer for the average user. It gets the job done, but without removing one's trusted sites.
Alternatively, there is a "hybrid" approach available: a tiny file called
DelDomains.inf which can be downloaded from
http://www.mvps.org/winhelp2002/restricted.htm
Right-clicking on the downloaded file, and selecting
install, will
automatically remove the domains, escdomains, and ranges entries you've cited above (but not the P3P history). Again, this approach removes the trusted sites as well the restricted sites.