Please Help me Get Symantec Email Blocking Off My Computer

I am using a computer at work that has a Symantec program on it that blocks many Web sites including Yahoo. My work wants me using my computer to open emails, but no one knows how to get rid of this Symantec program that our parent company had installed. When I try and remove just the basic Symantec anti-virus program from my computer it will not allow the operation. Any suggestions?

thanks.