Vista re-install without disk overwrite

I had a triple boot on an HP-nc6320 (XP, Vista, Win 7) and I inadvertently deleted Vista. Although I never used it, I’d like to keep it for a while. I destroyed the Recovery partition by the same token.

Is there any way I can re-install it using the official HP recovery DVD without overwriting the whole disk ?

If worse comes to worst, I can always back up the current partitions, install Vista from the DVD which formats the whole disk, copy back the saved partitions and use EasyBCD to create an appropriate MBR to reinstate the triple boot.

But, isn’t there something simpler?