Today, after my friend logged into yahoo messenger under her id on my computer, i can no longer login under mine. Every time i try it tells me that my account has been locked for security reasons. What the heck is going on and how do i fix it?

Your friend may have logged in under the secure mode. Try clearing out cookies. Go to Tools>>> internet options. Then clear out cookies and temp. internet files. Restart windows and then try logging in. If that doesn't work, maybe you need to look through the yahoo messenger help pages.

Thank you for your reply, Angela, but it turns out i'm just too stupid to remember my password since it always logged me in automatically. It locked my account because i logged in using the wrong password too many times.