GRUB and windows XP

After playing a bit with GRUB I got it to boot my windows XP and my Fedora (yeay!). But now my windows became awfully slow (hd seems to be the problem).

Does anybody have an idea what could cause this?

settings:

default=1
timeout=10
splashimage=(hd1,0)/grub/splash.xpm.gz
title Fedora Core (2.6.5-1.358)
root (hd1,0)
kernel /vmlinuz-2.6.5-1.358 ro root=LABEL=/ rhgb quiet
initrd /initrd-2.6.5-1.358.img
title hda2
rootnoverify (hd0,1)
chainloader +1

Your HD being slow is probably not related to GRUB. I use GRUB with RHAS 3.0 and Windows XP on my laptop and have never noticed any slowness. If the slowness only occurs in one OS I would check the runnins processes for that OS and see what your memory usage is. If it happens for all OSes then you may have a HD that is going bad. Check the error logs and run some diagnostics, especially any that came from your hardware vendor.