Debian Installation Prob -> DSelect

[Karl <myonlyb@gmx.net>]

Hi!
I have just installed Debian Base System, rebooted and wanted to do the 
"simple" install where packages are marked "install" already.
When installation starts (also via dselect), it asks for the first CD, 
starts and then stops at 80% of I don't know what with "E: Internal Error. 
Could not perform immediate configuration" and "Script stopped with Error 100".

So my questions:
What does this mean and what can I do?
Is there a log anywhere where I can see which package produced the error?
How can I get all the packages from the net? (I have to install PPP and 
PPPOE for DSL first but I don't manage to de-select everything new...)
Any other ideas?

 Tnx very much
  Reto