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Windows XP Tips, Illustrations and registry edits
To prevent users enabling or disabling the Internet Explorer add-ons using the add-on manager, try this:
HKEY_CURRENT_USER \ Software \ Policies \ Microsoft \ Internet Explorer \ Restrictions
HKEY_LOCAL_MACHINE \ Software \ Policies \ Microsoft \ Internet Explorer \ Restrictions
NOTE: To relax the restriction, change the value back to 0
Computer Configuration | Administrative Templates | Windows Components | Internet Explorer
To enable the restriction for the current user profile
User Configuration | Administrative Templates | Windows Components | Internet Explorer
If you enable this policy setting, users cannot enable or disable add-ons through Add-On Manager. The only exception occurs if an add-on has been specifically entered into the 'Add-On List' policy setting in such a way as to allow users to continue to manage the add-on. In this case, the user can still manage the add-on through the Add-On Manager. If you disable or do not configure this policy setting, the appropriate controls in the Add-On Manager will be available to the user.