|Have you looked at the other drives to see if the data is there.|
What did you use to delete the partitions? If you used a third party utilty the allocated drive letters in a different way you may have deleted drive D: when you thought you were deleting something else.
If that is the case then you wlll need recovery software and something that will recover deleted partitions. In the mean time do not do anything with the hard disk untill you have run the recovery software.