Okey - it worked!! Thank you very much. I guess I should have tried your fix before I swapped out the cards. But I was a little nervous because I didn't know what to expect. Now that we know this fixed it, any idea what happened?
Ensure the Windows sub-system secure files are original
Flushed the domain name server (removing conflicts)
Ensured the chipset which runs the card (via the PCIe bus) was correctly identifying it.