I would suggest physically rearranging your drives to the following,
sda = empty (fedora)
sdb = Win XP
Then, when you install F14 either specify the partitions manually or review the partitions and make sure everything is confined to sda.
Here is an example showing my manual partition setup,
sdb is my windows 7 drive.
F14 will automatically create a dual boot setup, installing grub to sda in the above scenario.
The good thing about this setup is it will not alter the windows (sdb) drive and replace the bootloader with grub.
I myself prefer this option, both drives are fully independent and capable of booting without the other drive present should the need arise.