Vista - Halo 2 won't install

Well I got this problem and I can't find a solution.

I got halo 2 6 months ago and I tried to install it, when I was on the menu where it asks for a folder to be installed and below it says "Full install only, do not start." I pressed continue and nothing happens It's not installing because I can't see the process ( I mean the process, not a window), I found this very annoying and I really need help I hope you can reply as soon as possible.

PC:
Windows Vista Ultimate x32 (Rank 4.9) and XP Professional.
HDD 10 Gb Free
1 Gb DDR2
GeForce 8500 GT 512 Mb
DVD Sony RW

There's 3 ways to install Halo 2 (Progressive install while playing the game, normal install while on desktop, and a 3rd that I can't remember) have you tried all 3?

yessir 3 ways, while playing, install and play after, and only install, I also tried enabling second logon (ppl from other forums say that) but still doesn't work. I don't know I mean my computer is not that bad it should be running Halo easily, any other help?.

Apparently, the Startup.exe file is screwed up. But there's an install fix out now that replaces any buggered Startup.exe with a proper one, so you original owners will have to ISO your disc and use that Startup.exe to install and play.