[QUOTE=Antartica]
The problem is that I've used the koma-script document classes, that are not in the tetex "base" package, but in the "extras" package. In Debian 3.1 Sarge (and I suppose that also in Ubuntu), this is installed with
# apt-get install tetex-extra
Sorry this bit is unintelligable to me. What do I have to do to get this? Is it posible on a Windows XP system?