Sometimes an on-board network interface card (NIC) conflicts with a new NIC. In these cases it is best to disable the on-board NIC.
The best way to disable your on-board NIC is to go into your BIOS and disable it there if possible. To do this, consult your motherboard manual.
You can also disable any NIC in Windows. Here is how you do this:
First click Start, or, in Windows 10 and 8, hold down the Windows key and press X. Then click Control Panel.