I have no clue what that bit does, but in the same location in my laptop (the only PC around up here in wild wooly windy wuwal Norfolk) I have in HKEY_USERS\S-1-5-21-725345543-854245398-1708537768-1003\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_LOCALMACHINE_LOCKDOWN
(Default) REG_SZ with (Data) (Value not set)
and tabbed under that
Settings
(Default) REG_SZ with (Data) (Value not set)
LOCALMACHINE_CD_UNLOCK REG_DWORD 0x00000001 (1)
A few lines further on is more interesting - it's
HKEY_USERS\S-1-5-21-725345543-854245398-1708537768-1003\Software\Microsoft\Internet Explorer\PhishingFilter
Dunno if that's any help.