I was recently configuring my Cisco 2911 router through a HyperTerminal session via USB connection.  I noticed when I first connected it told me that there was a 1 time username and password (cisco, cisco) and I should change this or I would be locked out.... sure enough I did not change it and am not unable to log back in with those credentials.

What can I do to reset the system to its factory default or log into the terminal session again to setup the user credentials?