No, selecting "boot dvd" is not how you do it. That option is only for adding a boot sector to the DVD, when you are burning the actual files onto a DVD. You aren't doing that you are burning a DVD image.... that is what the .iso is. The image is a complete image of the DVD including the boot sector, so there is no need to play with those boot options. BUT you do have to burn it using a program that understands .iso images and can expand them into the raw sectors that need to be burned to the DVD, otherwise you will just end up with the .iso file on the disk rather than the contents of the iso file. And then bootable or not, there will be nothing to boot from.
I'm sure nero knows how to do this, probably from the File menu there will be an option to select an image - just look for a dialogue that has .iso as one of the image formats. Otherwise use a tool that deals with them all the time. I use PowerISO, there is a free/trial version and it is very simple to use. It can be used for 'mounting' iso images as virtual drives which is very handy, but also for burning them. You just hit File-Open, choose the slowest speed from the menu and hit burn.
