Internet Explorer - Can't Open Internet Options

IE 6.0; When I try and access Tools/Internet Options, I
get a message "RESTRICTIONS: this operations has been
cancelled due to restrictions in effect on this computer.
Please contact your system administrator."

When I open Internet Options in Control Panel, I can
access everything, but all of the Home Page setting
buttons and controls are dim and I cannot change them.

Any help would be greatly appreciated.