Thank you for posting at Wired Communities. Just to double check if you have tried the following:
1) Change the cable to test
2) Un-install and re-install the driver
3) Install the network adapter in other system to test if will encounter the same issue
4) Have you also check with Dell support if CT desktop adapter is a validated network adapter on their system to check for compatibility.
Dear Sharon and wb,
Thanks for your input.
1) Checked different cable, still keeps happening.
3) We are using another network adapter of the same kind (on a different PC, connected to the same local network) and it has been working for a year without problems. I think this also answers 4)
Regarding 2), un-installing the driver: We have managed to 'Uninstall device' from the device manager but without any effect. However, we suspect that this 'Uninstall device' does not actually remove the driver software: As soon as we select 'Rescan for hardware changes' the network adapter appears instantly with the same driver installed. We spent a couple of hours on google on how to remove drivers but found no easy way of doing so. What would you suggest?
Also, we've purchased another identical network adapter and the problem persists.
Thank you for the reply. Code 43 error usually can be fixed by un-installing then re-installing the driver. The CT desktop adapter does not have Intel driver in Windows 10, it used the built-in driver from Microsoft*, please refer to this website for reference, the table list CT desktop adapter support inbox driver only which means it used driver from Microsoft. You may check with Microsoft for the driver.
As you mentioned the other CT desktop adapter works well on different PC, can you check with Dell support if there is compatibility issue?