yum update - kernel panic on boot

["Bret Stern" <bret_stern machinemanagement com>]

After performing a yum update, this boot message appears.

No volume groups found
Unable to find volume group "VolGroup00"
Unable to access resume device (/dev/VolGroup00/LogVol01)
mount: could not find filesystem '/dev/root'

more boot messages
.....
kernel panic not syncing



Found below thread about this...as a fix.

Append an ".img" to initrd-2.6.15-2.2054_FC5 so GRUB can find it.

Can I use Knoppix or similar to make these changes?

thanks