Debian Installer etch RC1 - problem

[Luis Cearra <luisjc@lem.eui.upm.es>]

 I have the netisnt for etch i386 Nov.2006.
It works fine until 
      Select and install software
It stops at 5%

 Alt-f4 (debug?) shows:
      Do you want to ignore this warning and proceed anyway
      To continua, enter "Yes"; to abort, enter "No";

 I have used different mirrors.
I (or the cd) have lost some keys?

 What do you recommend?