windows xp right?
make sure you have an administrator password (just in case)
remove that boot sector virus protection
grub-install /dev/hda
that should work but I'm pretty sure it will not recognize your windows on /dev/hda you'll need to add something like this
Code:
title Windows 2000
rootnoverify (hd0,0)
chainloader +1
title can be whatever you want
rootnoverify just says don't verify directory of hd0,0 (primary master, first primary partition)
chainloader hands control off to boot.ini