Windows vista does not come with Office 2007 installed on it already,
I had to visit a friend who had it on his computer and he also put
it on my laptop, which is Vista home basic (bad idea)
Anyways, Yes, Vista and Office need two seperate product keys
to be installed.
Ask your friends if they have 2007 on their computers, see if they have
product keys.
Sorry I couldn't help more.
Good luck
Psychopsis