Wenn installing RHEL5 Beta 1 on a non-PAE laptop (in this case IBM T42) and selecting virtualization, the xen kernel is installed correctly but then will refuse to boot with the notice that it is not possible to run a PAE-kernel on non-PAE hardware. If possible, anaconda should refuse to install a PAE kernel on non-PAE hardware.
anaconda drops the virt group from being visible on machines not capable of PAE now
I too have this problem, but on a ThinkPad T41. I've been using Xen on my machine with FC5 for quite some time now, but I guess, I have to build my own Xen kernel. I'm bummed.
I forgot to say I'm using FC6.