Hi Jose,
Have a look at the installation instructions here:
Did you download a new ISO and creat a CD from it?
The old CD's used to have a different install method where you logged into the node half way through the install but that is different now with the new CDs.
With the new CD, you are asked to specify the root password during the installation.
Good luck Jose - sorry I didnt get any further with your node a week or so ago - I had a serious car crash and have had rather a lot to occupy my mind because of that!
Kind regards,