Problem while loading

Hi!

I've downloaded Windows Vista from Microsoft Site, burned the ISO file into
a DVD+R, installed Windows Vista by oppening the DVD installation, and ok.
When Windows restarts, it asks what O.S. I want to open: Windows Versions
Early or Windows Setup. I choose Setup, and ok... Windows Vista starts
loading: into a black screen, there's a loading bar that seems to be black
and white, and finnally the Windows copyright sentence. Ok.

The problem's that the loading stops in 15/20 seconds, and I can't
understand why.
I've tried to choose the "Show what drivers are loaded" into the F8 menu,
and I can see again that loading stops. It stops while loading the /disc.sys
driver, but I can't understand why...

I've tried to install Windows Vista by mounting a Virtual driver, and the
error happens again... So, I think that the problem is on this driver.

Can anyone help me?

Thanks a lot.