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So, the D-Link Easy Search Utility doesn't work, here is what the D-link technician asked me to do with the Windows XP drive mapping.
Open Windows drive mapping by . . .
Click on Start
Right-click My Computer
Select Map Network Drive ...
You should see this dialogue box.
The drive letter should not matter, and we want to connect to the D-link DNS323 so click the browse button and look for it.
Here's the screenshot of my network places, we'll work through this slowly with images for each stage.
Begin by clicking the + next to workgroup to see what's there
So it's looking good, there is the DNS323
Click the + next to it
Mmmmmm, nothing showing under the Dlink, perhaps you do not see the volumes at this stage, but I would expect to see them!
Let's click the dlink and see what happens
The OK button is still greyed-out, so it doesn't look like we're going to be able to connect this way.

We should be able to create a new folder using the button on the left, but it does not.
OK, perhaps I'm doing this as the wrong user, even though the DNS323 is supposed to be open, I tried changing the user to admin with no password and got exactly the same results.
Let's check the unit by looking at its configuration there could be clues there.