I'd start by removing all the old saved passwords. Tools|Options|Security|Passwords->Saved Passwords There will be at least two entries, for sending and receiving. Use the filter box at the top to help find all yahoo-related passwords. What's your reason for thinking that your account has been "hacked"? Many people see spam messages using their email address and unnecessarily jump straight to the false conclusion that someone else has got into their account. This is rarely the case. A spammer doesn't need access to your account to use your email address in the "from:" field of his spams. Analysis of the message headers almost always shows it was sent by someone else.