hello everyone. my computer used to be fine but now my norton internet security 2003 is messed up. when i install it, it says do you want to install norton antivirus. i click yes but it says you already have a higher version of it. i installed nav 2005 before but i removed that now. internet security installs fine but nav doesent. also my bt yahoo browser doesn't work. usually when i click on it it opens up and you have to click on your name and it signs in. now no ones name appears and it is just a blank box with please sign in at the top. i have had this problem before but that was because of my firewall. i have to use internet explorer to access the net and i hate it. im not sure whats wrong with my pc but i would like to clear up these problems. can anyone help me? thanks in advance.