It occurs to me that if vasm or vxconf is not installed in your system the whole installation must be broken. You might be able to fix it by downloading packages from the repository using slapt-get but if you don't get a response quickly from that angle, I would go to a full reinstall.
If you try to install something with a lot of dependencies, then it might pull in enough to get the system going.
slapt-get -i xfce4 or slapt-get -i kde or kde-meta
slapt-get -i vasm
slapt-get -i gslapt
If you have to reinstall, download the cd again and burn it to disk at a lower speed. Sometimes this reduces errors.