Thanks very much for responding, no one on the D-Link forums has, and they had an extra day to ponder it.
The Netgear router had no lights when plugged into multiple outlets so I think the power supply and possibly more were dead.
The D-Link software may have added some software but I have found nothing in the programs list called D-Link or that jumps out as being connected (so to speak) to the new hardware. And Windows 7 hasn't highlighted anything as a recently installed program. Now whether they changed something already there, I don't know.
My current firmware is E1 and I'll look into that E3 rev. tonight. I remember seeing something about new beta firmware on their forum but I think that referred to a different hardware revision. I'll double check tonight.
If that doesn't bring any joy my plan is to temporarily turn off the security or password in the router, if I can, and see if the Windows 7 machine will at least connect that way.
Thanks again for giving me some hope and pointers.