I have a Levono laptop with a built-in wired Ethernet. It was working until I installed Virtualbox. Now the adapter is showing as "unknown device". When I install the NIC driver from Lenovo's site, it acts like it is complete but it still remains the same. Any thoughts, besides removing VirtualBox? -- G. Morgan

Falcon ITS wrote: >http://wazem.blogspot.com/2008/07/virtualbox-xp-nic-driver-problem.html Thanks, but that wasn't it. For some reason after I installed VirtualBox the Device Manager lost my NIC and the "unknown device" was Lenovo Energy Management (ACPI\VPC2004). <-- I wonder if the "VPC" had anything to do with it screwing up (Virtual PC??) I installed the Lenovo Energy Management (LEM) driver, and after a reboot my NIC was there and the LEM driver too. -- G. Morgan

Hi, I suspend the "unknown device" is your virtual box network not being installed properly. Would you please let me know if the unknown device still exists in Device Manager after installing Lenovo Energy Management (LEM) driver? From my research, the issue can be resolved by installing the driver manually. If the issue occurs again, please remove the unknown device directly to check the result. Regards, NikiPlease remember to click "Mark as Answer" on the post that helps you, and to click "Unmark as Answer" if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi, I suspect the "unknown device" is your virtual box network not being installed properly. Would you please let me know if the unknown device still exists in Device Manager after installing Lenovo Energy Management (LEM) driver? From my research, the issue can be resolved by installing the driver manually. If the issue occurs again, please remove the unknown device directly to check the result. Regards, Niki Please remember to click "Mark as Answer" on the post that helps you, and to click "Unmark as Answer" if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.