Is Windows a good citizen on the harddisk nowadays? I stopped trying Windows releases because they used to change my bootsector or something, so my machine suddenly only booted Windows. Instead of showing me a menu (grub?) of partitions to choose from.
That's mainly due to the old BIOS mbr only supporting one bootloader at a time. I know on my old BIOS PC that when I installed a linux distro it would displace the windows bootloader with grub, and vice versa. On UEFI based systems, this is less of an issue, as I believe you can have multiple bootloaders.