You don't edit the ISO to dual boot. Generally you will want to install Windows first if that is what you plan to dual boot with. Make sure to leave space for your Linux distro. Then when you want to install the linux distro you specify that you want to dual boot during the installation, or during the partition configuration. I have never dual booted Windows with Linux so not sure how much help I can be, but it seems easy enough. You could always just follow this tutorial if you are using Ubuntu in addition to Windows https://help.ubuntu.com/community/WindowsDualBoot to remove stuff from ubuntu you generally can just do sudo apt-get remove name-of-package just post any other questions here or if you need more help on the other things , do you get stuck on something ?