non-php issue

hi everyone, could someone recommend a security mailing list, please? or you may like to answer my question below: i'm currently using outlook express 6 on WinXP Pro, and something strange happened: everytime when i start the computer, some messages pop up and attempts to sending the replies of the emails (in the inbox) in behalf of me. my anti-virus software doesn't work at all. what's the problem. how can i fix it? please help!!!! cheers, feng