You'd mentioned in a previous post that LILO appeared to conflict with Windows; I may be wrong, but I think it had more to do with the PM8. Did you try to boot to XP after creating the partition?
There may be an easier way to fix it, but what I'd do is repair the MBR for Windows (
this thread covers that topic, thanks lynch!), and make sure you can boot to XP. This will lock you out of RedHat, but there may be a way to install GRUB without losing the RH install; otherwise, you'll have to trudge through it again.
Perhaps someone with more experience can help with installing GRUB...
edit: BTW, Welcome to TSG!