The i386.iso images of RH9? Yes, that would be correct.
More likely that something is messed up with root's environment settings. Log in as a user, then switch to root (su -) and provide back the output of:
ls /sbin
insmod (and a number of command executables) reside in /sbin normally)
which insmod
would normally tell you where it is, assuming it's on your machine. Also
try
set
and then provide back the PATH variable.