I quite like the "duel" booting misspelling there.
In my experience there should be no duel between Windows and Linux on a dual boot machine as long as you are installing Linux on a machine that already has Windows on it.
Now, my experience is only with Mandriva, Win2k and lilo, but in that instance it just worked when I installed Mandriva 2007.0 on a Win2k machine. lilo just picked up Windows once Mandriva was installed and gave Windows and Linux as teo boot options.
I did a bit of reading around beforehand by searching on Google and it was as easy as everyone claimed. It might be worth a Google search to see whether Vista creates problems Win2k does not.