I suppose this is Red Hat 9 ? from ancient times?... Consider installing a more recent version of Red Hat Linux (oh, and, saying you are installing Linux isn't very helpful, the distribution matters, be it Red Hat, CentOS, SuSE, Ubuntu or whatever will help much).
As for 'normal' and 'smp', the smp is for systems having multiple cpus (or cores). the 'normal' one is for single cpu (with only one core!).
Really, if this IS Red Hat 9, you should not use such os unless you know what you're doing.