How to Fix Network Controller is Not Working in Windows 7
If you open Device Manager, an yellow mark is indicated in network adapters section and will display as Unknown device. Even if you install the driver that comes with the CD, an error message popups saying “Driver was not successfully installed” or “Windows could not find driver for this device”. For these cases, a correct device driver from the manufacturer website must be downloaded and installed.
How to Fix:
Step:1 – Download Unknown Devices v1.4.20 and extract the archive.
Step:2 – Run UnknownDevices.exe
Step:3 – It will display a list of unknown devices and their appropriate device drivers.
Click Here to Download the Unknown Devices v1.4.20