Win7 system does not detect how the NIC resolves?

1, first click on the "Computer" icon click on the right mouse button, selected management;

2, the appearance of a window, selected Device Manager, you will see a small question mark, select this small question mark device;

3, click the right mouse button to select the installation (update) driver (if you have installed the motherboard driver, he will automatically find the driver of the network card, if the motherboard has not been installed driver, the drive CD into the CD-ROM drive), until the small question mark all disappeared,

4, if you reinstall the system changes the BIOS settings, where you can not see the network card (device does not start, do not find the system, do not install the device driver), you need to log off in the BIOS of the device to re-enable.