You shouldn't be trying to install Kubuntu at all unless you have a good reason.
Download (using the torrent only) 0710RC2 i386 DVD version (not the dual layer version), then burn the iso to DVD using the slowest possible speed.
Put in the drive of a blank machine (do not install windows or any other OS first, it is unnecessary), power on and boot from DVD.
Note that this will wipe the hard drive completely and place LMCE on it instead.