well,in that case,you have to ask windows guys to how to add Linux to windows boot menu.
also,there are few 3rd party boot loaders too.
the best IMO is to install grub,make vista and xp boot options.
if you prefer to boot into xp,no problem grub got that option too!without showing grub menu,grub can boot into xp/vista .
For that you have to use "hiddenmenu" option with time out to be 3sec rightly.
if you want at the moment to boot into Linux,no problem,press ESC key and grub menu will appear
I think Fedora by default has "hiddenmenu" option albeit set for "fedora" to boot as default