I cannot make changes in the Norton Personal Firewall

Hi

 

I am new with Norton. It came in the PC I just bougth. I am having a problem because I cannot do any changes in the customization of the Personal Firewall. There is an error message saying I have no autorization to perform changes. If I click in the Options button I get the same error. This is weird because I am the only user of my PC. If I don't have access to do any changes who has?

 

Please help.