If you are running Oracle on Windows and are using a Windows domain account subject to password expiry you need to remember a few follow up tasks after your password has been changed.

• Make sure any Windows scheduled tasks have the new password. You should only need to change one scheduled task and all get the change
• Go into EM/DBConsole preferences...

If you are running Oracle on Windows and are using a Windows domain account subject to password expiry you need to remember a few follow up tasks after your password has been changed.

• Make sure any Windows scheduled tasks have the new password. You should only need to change one scheduled task and all get the change
• Go into EM/DBConsole preferences and enter the new password for each preferred credential. This includes the Listener, Host, Database Instance, and Agent.

Read more http://billennis-ssts.blogspot.com/2011/03/oracle-on-windows-and-password-expiry.html