Let's try to see more clearly through your situation:
I assume that you followed instructions in README_CRYPT.TXT
to create your LUKS and LVM partitions.
So you should have a filesystem configuration like this:
with your LUKS/LVM partitions created on /dev/sda2.
Here are the steps I would recommend:
1) Boot using your installation DVD or first installation CD. At the prompt type in:
hugesmp.s root=/dev/sda2 rdinit= ro
2) Go into your /boot directory and create your initrd file:
mkinitrd -c -k 18.104.22.168 -m ext3 -f ext3 -r /dev/cryptvg/root -C /dev/sda2 -o initrd-22.214.171.124.gz -L
Check that file /boot/initrd-126.96.36.199.gz has been created.
3) Update file /etc/lilo.conf. The entry for the 188.8.131.52 kernel should look like:
image = /boot/vmlinuz-184.108.40.206
initrd = /boot/initrd-220.127.116.11.gz
root = /dev/cryptvg/root
label = 18.104.22.168
4) Run the lilo command to make sure your changes to lilo.conf are taken into account when you reboot: