A while ago k0lo helped me in separating my XP and Vista installations, and installing Grub4DOS as boot manager. It has been so successful that I have made the mistake of advocating this setup to others, and as a result I am now being asked to help in doing it k0lo's advice on adding a second OS was - "So now if you want to add another OS on your machine just create a partition for it, install it, and add another menu item to your menu.lst file. Note that since you have a boot manager, the need for installing operating systems in primary partitions goes away. You can add any other OS, even Windows, to logical partitions and they can be booted from grub4DOS." The party in question has a Vista installation and wants to add XP Pro, and I need to know if this raises any special issues. Normally Vista is installed after XP, not before. Also, I was wondering whether doing this would overwrite the MBR, and what to do if it does.