I think that when the installer gets to the point of choosing to automatically partition, or manual partition using druid, choose manual. First delete the LVM partitions. Then make new partitions, i.e. /boot=100, /=whatever, swap=ram times 2, /home=whatever. Be sure to de-select the drive which contains the os you want to keep, and that your boot loader (mbr), lilo or grub, is installed on hda. Your other os will show up in your boot loader as second choice..... grub would look something like this....
# cat /boot/grub/grub.conf
# grub.conf generated by anaconda
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,1)
# kernel /vmlinuz-version ro root=/dev/hda5
# initrd /initrd-version.img
title Fedora Core (2.6.11-1.1369_FC4)
kernel /vmlinuz-2.6.11-1.1369_FC4 ro root=LABEL=/1 rhgb quiet
title Fedora Core 3 (18.104.22.168-fc3w4l-6.11)
kernel /vmlinuz-22.214.171.124-fc3w4l-6.11 ro root=LABEL=/1 rhgb quiet
title Win XP Home sp2
Hope this helps.