Hi, can anyone please tell me why do they keep asking me to set my shh key and enter a passphrase after i complete the installation of rocks, yet is not able to get into xwindow? Sorry a total newbie.

What is rocks?
I assume that you meant the secure shell (ssh) rather than shh.
Do you have ssh installed? Check if you have a ~/.ssh directory. This directory should contain your secret and your public keys, as well as a list which contains the public keys of the sites you have connected to. If one of the values has changed, you will not be able to make a connection to protect against a man-in-the-middle attack. If you have altered the permissions of the secret key to make it world readable, then you will not be able to connect because your secret key is actually publicly visible, and ssh will refuse to connect because the secret key is no longer secure.

Yes, i do mean ssh, sorry about that.
Thanks for your help. Rocks is a cluster program which I am still trying to figure out how to use.
Another question
When i tried to insert a slave node, the follwing error message came out:
Rocks distrubution not ready (There's only one "OK" option)
OSError:[Errno2]-no such file or directory: 'home/install'
Anyone knows why?