Hyper-V Network Adapter Will Not Start Code 39

Question

Testing a production failover of a Server 2019 VM from ESXi to HyperV. This scenario worked in my lab, but I’m getting this error on the production test for the Hyper-V Network Adapter:

Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39) {Driver Entry Point Not Found} The %hs device driver could not locate the entry point %hs in driver %hs.

I have already tried removing and adding a new adapter. I would like to reinstall drivers, but I can't find them.

The may be another relevant error: The driver \Driver\netvsc failed to load for the device VMBUS{f8615163-df3e-46c5-913f-f2d2f965ed0e}{df57aa94-e1d6-4853-b3fb-4c8258056e0b}.

Answer 1

Hi CJ,

Hope you're doing well.

Based on the error message you provided, it seems that the driver for your Hyper-V Network Adapter is either corrupted or missing. You can try reinstalling the drivers to fix the issue. Here are some steps you can follow:

1. Open the "Device Manager".
2. Locate the "Hyper-V Network Adapter" and right-click on it.
3. Select "Uninstall device" from the context menu.
4. Restart your computer.
5. Windows will automatically detect the device and install the required driver.

If the issue persists, you can try the following methods:

1. Reinstall the drivers for the device. Uninstalling and then reinstalling the drivers for the device that's experiencing the error is a likely solution to this problem.
2. Update the drivers for the device.
3. Replace the hardware. It's possible that the device isn't compatible with this versionof Windows.

Best Regards,

Ian Xue

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