Adding trusted sites to IE

I have done a program that adds a trusted site to the IE registry entries, but I have two problems:

1, I can't delete the entry in the IE options dialog.
2, I can't add IP sites, the IE use the "Ranges" folder to add ip sites, but even inserting it manualy to the registry I can't view it in the IE options dialog.

Please If you know how to solve this problems, tell me anything.

Thanks