If you installed VB 2008, then DX10 SDK, then darkGDK, (in that order) it should show up. What you might have done is run the first installer and mistaken it for installing Dark GDK (I did that, in that case, just run the other installer that it just unzipped). Also, make sure you have the DX10
SDK, not just DX. The wizards will show up in the main window when the category where the red arrow is pointing is highlighted (it isn't shown in this screenshot because I am doing this with my computer w/o darkGDK). Hope this helps.
I cannot begin to describe how important the semicolons are.
They are just too freaking important.