First, grub2 does not have a menu.lst, so forget that. Second, installing grub to the mbr will not alter your windows xp environment whatsoever. What grub2 does do is tell which files get loaded each time you boot. Both linux and windows have boot folders. Grub2 should properly read your hard drive partitions and then place the location of each os's boot files in grub.cfg You can then choose to have the computer go to your windows boot or your fedora boot. Once you select windows from the Grub2 menu, grub tells the bios to look at the windows boot files, and then windows takes over. Just follow the steps of the Fedora installer. If you have a question on a particular section of it just ask me. Basically you should be installing grub2 to mbr. Also once you have it installed, just Google search "Fedora Grub2" and you will see 2 wiki pages that you can use to help you update grub2 if needed. I do not take any responsibility if something goes wrong, and if your scared just don't do it, but I can guarantee that if you have a problem after you install Fedora, we can solve it and if you don't like having grub2, you can use a windows xp recovery cd to reinstall windows bootloader. Also, if you have any questions prior just ask here.