Ravi,
Those default passwords were for earlier SAP releases. In NetWeaver 7.02 they are no longer used. When you did the install, at one point you would have been asked to supply (create) a "master password." The password you chose during install should have been set for the DDIC and SAP* users.
If you can't recall the password you set, and you have access to the OS filesystem and to restart the system (which you should, given it's a trial edition), then you can change the profile parameter login/no_automatic_user_sapstar to value 0 (default is 1), and delete the SAP* user from USR02 in client 000 using database tools, as Alejandro mentioned, then restart the system. Then you should be able to login to client 000 as SAP* with password = PASS. From there, you can set your DDIC password, create your own superuser, etc. Note that when you're done, you should change the profile parameter back to 1 (or delete the parameter), and create (and perhaps lock) a SAP* user in SU01, then restart the system again.
You can change the profile parameter in your client 001 via transaction code RZ10. You can set it in either the instance or default profile.
Best regards,
Matt