Have a gander at this part of your registry (The numbered part might be different).
HKEY_USERS\S-1-5-21-2748988797-3819586868-2235420531-1001\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains
Mine is blank?
Been researching this... Seems those entries must've been there for yonks, coz they seem to be things that're in IE's trusted zone. As I ain't used IE for years, they must be left over from then. I sure wasn't me that trusted them, though, coz many of them were seriously dubious...