If Windows overwrites your MBR you can fix it fairly easily. Boot from the FC1 CD in rescue mode. This mounts your root partition at /mnt/sysimage, so run # chroot /mnt/sysimage to make it the root filesystem. Then run # grub-install /dev/hda (this assumes that GRUB is to be installed in the MBR of the primary master disk, if not you'll need a different command).
Fixing XP wasn't my primary worry. It was the Grub situation that had me in "newbie terror" mode.
As to fixing XP, that's another issue and one which doesn't really belong here. The only advice which should appear in this list for fixing XP is to run mke2fs /dev/hda1 which will cure all problems with XP (but I won't because that wouldn't be nice). Basically, you need to boot into safe mode and delete all devices related to the changed hardware - graphics card, IDE, USB etc. Then reboot and let XP detect the new hardware. Make sure you backup any XP files you need to keep as this process doesn't always work, changing the MB sometimes requires a re-installation of XP.
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