ASUS firmware update nforce A8N-e
 

While troubleshooting a USB 2.0 problem, I updated my nforce4 drivers to
latest for my A8N-E mobo. Today I noticed that I could not disable my
network adapter. I got a message:

" Cannot disable ... either not plug-n-play compatible or in use by
another user or system. Check with your administrator. "
I remembered getting a "not certified as pnp" when I installed the
update, so I rolled back the driver on the onboard nic - rebooted and
now working "normally again".