Network adapter does not showing in device manager
If all else fails, add a PCI or PCI-E Network card. That should fix the problem.
1.Before doing that though, open a Elevated Command Prompt.
2.Type set devmgr_show_nonpresent_devices=1 and press Enter.
3.Type devmgmt.msc and press Enter to open Device Manager.
4.Click on View then Show Hidden Devices.
5.Scroll down and see if Network Adapter is present now or if an Unknown Device shows up. Which ever it is, right click on it and select Uninstall. Reboot and see if Win 7 redetects the device and reloads the driver for it
