formatted vista hd in rage and ....

Hallo, I am in the uk and recently purchased a new pc with vista home edition
on it.
I had a xp pro pc as well and transfered all my files over with the belkin
usb transfer cable. I found may of my software program would not work on
vista, and in a rage, I formatted the vista h/d. I dont have an installation
cd from pc world as it was preloaded and they cannot / dont want to help me
further.I have since then put the xp pro h/d in the same pc and have two h/d.
The vista h/d is untouched since the quick format.

Question: How can I recover the installation


Thanks