new install - grub won't boot windoze

[starcycle at gmail.com]

i just installed FC5 on a family member's computer (that's 2 so far
:D), but it won't boot the windows XP OS. when i select xp from the
menu, the screen just goes blank for a second, then it goes back to
the grub menu and starts the countdown again (or continues it, don't
remember). can anyone help me troubleshoot this? is it an NTFS
problem?

here's the menu.lst, FC boots fine:

default=0
timeout=12
splashimage=(hd0,5)/boot/grub/splash.xpm.gz
#hiddenmenu

title Fedora Core
        root (hd0,5)
        kernel /boot/vmlinuz-2.6.15-1.2054_FC5 ro root=LABEL=/1 rhgb quiet
        initrd /boot/initrd-2.6.15-1.2054_FC5.img

title Windows
        rootnoverify (hd0,0)
        chainloader +1
~

fdisk -l:


Disk /dev/hda: 41.1 GB, 41110142976 bytes
255 heads, 63 sectors/track, 4998 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1        1020     8193118+   7  HPFS/NTFS
/dev/hda2            1021        4998    31953285    f  W95 Ext'd (LBA)
/dev/hda5            1021        2287    10177146    b  W95 FAT32
/dev/hda6            2288        3562    10241406   83  Linux
/dev/hda7            3563        4932    11004493+  83  Linux
/dev/hda8            4933        4998      530113+  82  Linux swap / Solaris


thank you