Outlook Express- AIM

Hi,
I have a question when I open my outlook express to check my email my AIM mssenger opens up. It used to automaticly sign on but I went into tools...options...then I unchecked it to auto sign into aim. Now it doesn sign into IM everytime I open outllok express but it does open AIM can anybody please tell me how to make it stop opening aim everytime I open up outlook express.

Thank you so much