Partition magic will do it but it is a program you must pay for. There are some free programs out there and I am told some are ok just maybe not as easy to use as partition magic. I have only used partition magic to do this once normally I would back everything up and reformat to do it. I reformat every couple of months anyway so for me it is no big deal.
you could use diskpart, but it's a command line utility. You would probably have to delete one of your partitions to do it though. It can only expand a partition into free space, so it wouldn't be able to shrink the D partition.
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