I have done absolutely

nothing to my browser - am using highest level IE 7 - it will not let me upgrade to ie8 as it says it will not "yet" work with my 64 bit stupid Vista.
is there a place now at MC to mark "stay logged in"? I have only done the recommended most important updates from microsoft. this is the only site that I have problems with. I cannot find where cookies are stored in this stupid Vista pkg. Could MC now be using a tracking cookie that my Norton antivirus disposes of?
update - I just ran my security scan and it showed 2 mycoupons cookies to dispose of - so that is what is doing it Why does Norton think MC cookies are dangerous? AND why do I keep getting the invalid member name/password message when I log in even though it logs me in?