When I installed Red Hat 7.3, the system crapped out when it tried to initialize PCMCIA. This failure is similar to that of Red Hat 7.0, except that it said something about pci=biosirq. I could not get into the interactive install.
I had to boot in single user mode. I disabled PCMCIA the same way I disabled it on Red Hat 7.0, by loading /etc/sysconfig/pcmcia into a text editor and changing PCMCIA=yes to PCMCIA=no. I don't have any PCMCIA stuff.
Red Hat 7.3 could not find a mount point for my Windows 95 partition. I was prompted for a Windows mount point when I did the install, and I provided it, but it didn't work. Check my Red Hat 7.0 notes below, for the most likely explanation. All I had to do was to create the mount point.