What do you mean you have a "virtual copy" of Vista? Do you mean its an ISO?
If so, burn it to a disk using disk utility, then boot off it when running Bootcamp. You can't do a Bootcamp install from an ISO, though you COULD use Parallels or Vmare with one.
Also, what do you mean by "recycled copy"? Is this a key someone has already used, but no longer is? You shouldn't run into too many activation problems... if you do you'll have to give Microsoft a call and explain that the other person uses it no longer, and activate it manually.