I installed norton anti virus 2007. Since then when I close the windows internet explorer provided b

I installed Norton Anti-virus 2007 a few days ago. Since then, I have trouble closing the window internet explorer provided by yahoo. I click on the X and a blank page and web site with the internet logo and "blank" appears on the directory. I cannot close the page unless I send error reports repeatedly. What's going on?

I installed norton anti virus 2007. Since then when I close the windows internet explorer provided by yahoo?windows updates

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