Previous ISE versions the application <GUI> login/password was <admin> <cisco>. However, with version ISE 1.1.1, the application login is setup during the initial installation under APPLICATION.
You must configure the Cisco ISE Admin password at the time you install the Cisco ISE. The previous Cisco ISE Admin default login credentials (admin/cisco) are no longer valid.
http://www.cisco.com/en/US/docs/security/ise/1.1.1/user_guide/ise_dis_deploy.html
Should you forget or need to reset this login and password you can via the CLI with the following command:
ise111/admin# application reset-psswd ise admin