Bought used computer- someone's email is the default- How do I get rid of this?

When I go to yahoo on this computer, and then hit mail, it goes all the way in to the previous owner's account, without stopping at the sign in screen or anything.. I want to get rid of this and make it normal, so that when I click Mail, I get the user name and password prompts and can go to my own email. Please help. Thank You
Bought used computer- someone's email is the default- How do I get rid of this?
Logout and login with your email.





But this is pretty strange, since Yahoo mail has a 2 week period for your email to stay active. Has it been longer than 2 weeks?
Reply:on yahoo? click the sigh out button, and just log in to your account.





on the built in email client? wipe the hard drive, then reinstall the OS.





your welcome