IE Security tab Internet zone Custom tab disabled

On my XP laptop, post installing SP2, IE Security tab Internet zone Custom tab has been disabled, and no amount of persuasion can get it to become enabled again. THis is causing all sorts of problems when browsing. Presumably there must be some registry value that controls this option - but I can't find it.  Anybody got any clues?
edelsten_nAsked:
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rubiconxCommented:
[HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel]
[HKLM\Software\Policies\Microsoft\Internet Explorer\Control Panel]

http://windowsxp.mvps.org/ie/secchangesettings.htm

May work!

Regards,

Dave
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EricCommented:
take a look at the Local and Group Polies on the machine and see if the custom option is disabled.
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edelsten_nAuthor Commented:
SecChangeSettings does not exist anywhere in registry; no evidence of custom option in local / group policies;
[HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel], [HKLM\Software\Policies\Microsoft\Internet Explorer\Control Panel] reg entries do not exist. Arggh!
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rubiconxCommented:
Probably a daft question but have you tried resetting the IE settings?

open IE, Tools menu, Options, Program Tab, and click the "Reset Web Settings" button.

**********

Add
[HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel]
[HKLM\Software\Policies\Microsoft\Internet Explorer\Control Panel]
and give them DWORD values of 0

This will just make sure that Windows hasn't got a corrupted entry somewhere.

http://www.winguides.com/registry/display.php/797/

**********

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3

This is the registry area that controls the Internet Zone setings.  I don't really know this area but your problem may lie in here.
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rubiconxCommented:
Been running tests on the HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3 area mentioned above.  What is the DWORD setting of the Flags key (near the bottom)?  Various values turn off the Custom option.  I've checked the value on three different PCs and they all have a value of 1.
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