Can't find the answer anywhere

I have a copy of Windows Vista, however, I downloaded it, and thus there is no CD.
I have a Mac with OSX and an old Laptop which runs with Ubuntu.
I want Windows Vista on at least one of these.
I have no CD, and no Flash Drive.
How do I go about installing the xp.iso file as an OS?
I was guessing that I would need to use a virtual disk drive - however I can't find one for OSX or for Ubuntu, and whenever I try doing it through terminal on either system I just end up running around in circles.
Does anyone know how I can install Vista onto OSX via bootcamp without a CD - or onto Ubuntu without a CD?

Please enlighten me!

Help greatly appreciated.

Nice title!

- Nick

Aye, didn't really think about that at the time. My bad.
Thanks for the constructive feedback.

Silencer said:

I have a copy of Windows XP, however, I downloaded it, and thus there is no CD.

Click to expand...

Where did you download Windows XP from?

- Nick

Its actually Vista SP2, sorry, can't remember where I downloaded it from, it was a few weeks ago now.

Can we assume that you pirated Windows? If so, don't expect any help from anyone here.

The answer is to purchase a legitimate copy of Windows. Then, you wouldn't have to worry about how to install a pirated copy for which there is no help here.