Bad initrd after FC7 install

[Andrew Robinson <awrobinson-ml@xxxxxxxxx>]

I installed FC7 on my eMachines laptop. The installation seemed 
successful. On the first boot afterwards, I get a "Kernel Panic" message 
right after the line that announces the kernel is booting. At first I 
thought something was wrong with grub, so I started comparing my /boot 
directory with that from my FC6 installation. What caught my eye was this:

-rw------- 1 root root  50 Jun 13 17:19 initrd-2.6.21-1.3194.fc7.img

50 bytes seems small for the initrd file. What do I need to do to fix 
this? Can I copy this file from somewhere else? Can I create it? How 
would I do so when I cannot boot into the OS? Bottom line, how would I 
fix this?

Thanks!

Andrew Robinson