From now till a real techie comes, here's a link which might be for a use to you:
http://www.gidforums.com/t-2363.html(you'll notice that "Jacko" got the same problem, and found a solution for it. You may use that same method if no one suggests something else.)
P.S. Just wanted to add that your data on "D" drive needs to be recovered, by this method or another. So, I suggest that you don't install any program on that partition, because that'll overwrite the existing data.
Of course, there are some who prefere to use another recovery program like
THIS one, while others use another.