Red Hat 7.2 didn't include support for the Geforce4 MX in X yet. This doesn't mean you can't use your Geforce4 MX. As temp solution I would edit the file "/etc/X11/XF86Config-4". That file contains a lot of so called "sections" one of those is called "Device" change the video driver in it from "vga" to "vesa". Or try to select the driver "vesa" in Xconfigurator.
Later you install nvidia's own linux drivers. Those drivers are much more advanced those bring you things like 3D support, Xv (for movies) and more.