Get this tool, SpyBot S & D http://security.kolla.de/ installed. Nice to
have should you ever get some parasites.
go to SpyBot - Search and Destroy Immunize, and check the "Lock IE Control
Panel..." box.
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After any one trying to open Tools/Internet Options will get this message.
"This operation has been cancelled due to restrictions in effect on this
computer. Please contact your system administrator."