Installing vista 64 from 32 without dual layer dvd

Okay, I downloaded (torrented) Vista black Edtion x64
http://www.google.com?t=1773128&start=0
I didn’t see that the iso was so large, but regardless I’ve already downloaded it. Is there a way:
1. To install the 64 bit onto a partion while in vista 32 (like mounting it on virutal drive)
or
2. Install the dvd into two seperate dvds?
Answer #1
I just deleted the software folder and saved as a new ISO and burned to a normal DVD-r…
Answer #2
EDIT: Gotcha thanks