Kernel panic

[Smith Pan]

Dear Sir,
> I use Redhat 7.0. I want to use your kernel-2.4.0-1.i386.rpm ...to Update my linux.
   After I rpm -ivh kernel-2.4.0-1.i386.rpm kernel-headers-      2.4.0-1.i386.rpm kernel-source-2.4.0-1.i386 ...and I 
     modified /etc/lilo.conf,run /sbin/lilo.
  Then restart,System tell me : Kernel panic:VFS:Unable to mount root fs on03:03
.
  And I use mkinitrd /boot/initrd-2.4.0-1.img 2.4.0
  system tell me:
     mount: /dev/loop0 has wrong major or minor number
     Can't get a loopback device.

 Could you help me?
 Thanks a lot.

Best regards,
Smith