I'm not very happy with D-Link. I am experiencing this exact issue and their answer to this when I called customer support ,after doing my do diligence and trying all 4 driver packages, is to do an RMA. What is angering me is that after I spent $50 on their product now I have to pay to ship it to them and ship it back. So I am having to pay more money to get a product that should have worked in the first place. Also if the product is found to be in working order, which it is on Windows 7, I am going to get charged a %10 restock fee. This is not very good tech support for something that they have been having trouble with for 3 years now.
So D-Link doesn't have a answer for this issue. Just a FYI for anybody looking at this issue.