I was thinking you probably haven't installed any Linux Bootloader. I was thinking GRUB would be a fine choice. SInce it looks like you didn't install GRUB during the initial installation, just open a terminal window (when logged on as root) and run this command at the prompt
as in #/sbin/grub-intstall <location>
This should install GRUB to the MBR(That's WHERE you want it by the way!), it wont overwrite the Windows bootloader but it should take control of the whole boot process becoming you're default boot loader and write the grub.conf file accordingly.
Then I guess after you've rebooted your machine and are now sure that GRUB is working, you'd have to add stuff to the grub.conf file to help it find Windows...something like
title Windows XP PRO
#this is assuming windows is on the first partition of your hard drive
This look alot like what anaconda generated for me when I intalled it on my machine
By the way in the (hd#,#) notation, hd# specifies the hard drive and # specifies the partition on the drive with 0 being the first partition, drive etc........
Check out this link before you try all this though
I sure hope this helps...holla back and let us know
Sammy Boy (Megamix-X)