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It's possible that not using the correct driver for the OP's card hardware revision is part (or all) of the problem here. Chinny22's link was to D-Link's product support for the DFE-530TX, and that card is distinct from the DFE-530TX+. There is still a D-Link support page for the DFE-530TX+, but it only has drivers for the F and G hardware revisions of the DFE-530TX+:
http://support.dlink.com/ProductInfo.aspx?m=DFE-530TX%2B
So the question is (for the OP), what is the exact hardware revision of your DFE-530TX+? It should be printed on your card or on a sticker on the card. Also, do you have the CD-ROM that came with the DFE-530TX+ (assuming that it is a retail card)? It should have a complete driver set for your particular hardware revision.
I still use DFE-530TX+ cards in all of my old Windows 98/WIndows ME machines, and they were purchased in the late 1990s/early 2000s. If memory serves, they tend to be hardware revision C or D, and I am using drivers that I downloaded from D-Link back in 2003/2004.
A photo of a HW Revision E1 is attached with the revision number on the upper left of the card. The HW revision number is also printed on a sticker on the back of the card.