Email has been hacked


New Email
My email address has been hacked and messages are being sent to people in my address book. My provider suggested changing my password, which I don't want to do unless absolutely necessary. I've run a full scan on my computer this morning, which showed no virus. I have tried to create a disposable email address & if any suspicious messages show up in that folder, then I will know I've been hacked again. However the Yahoo system keeps asking me to enter the keyword but does not give option as to where to enter it. I don't know what else to do to prevent this ongoing stuff