In Device Manager double click on the Ethernet to see it's Properties, click on the Driver tab, click on "Driver details" button. On the "Driver File Details", under "Driver files" do the files show with green check marks?
Try these:
- In the Device Manager, highlight the device and press the Delete key. When prompted, confirm that you wish to uninstall the device. Do not restart the PC.
- In the Device Manager, click the Scan for hardware changes button (near the top). Windows will now scan your system for hardware and install default drivers for anything that requires drivers at this time.
- If the error is still present repeat item no. 1. In Action menu, click"Add legacy hardware" -> click the "Next" button -> on the "Add Hardware" box tick on "Install the hardware that I manually select from a list (Advanced) -> click the "Next" button. Under "Common hardware types:" choose "Network adapters" -> click the "Next" button. Under manufacturer choose HP -> choose your Network adaptor from the list. If reinstalling the default drivers by using the Device Manager does not correct the problem, you may need to reinstall the original and updated software drivers from the HP web site, then click on the "Have disk" button instead and browse to the driver you downloaded. Follow the remaining prompts, you may need to reboot.
For more troubleshooting information HP Support:
Solve Internet or LAN Connection Issues When Using an Ethernet Cable to Connect to a Router or Modem
Ehternet download:
Realtek RTL8168C/8111C/8102E PCI-E Ethernet NIC Driver
Hope I could help