how do I get office reloaded after a destructive reload?

I bought office 2007 and downloaded it direct to my laptop a couple months
ago. Yesterday my laptop froze and then I got a blue screen telling me a
probem involving a kernel caused my computer to be shut down to avoid further
damage. It could not be restarted again without resorting to a full
destructive reload. Now I want to know what I can do to get my office 2007
back without repurchasing it.
.