The RTL8139D is a 10/100Mbps card. If you are stuck at 10Mbps: Right-click the adapter in . Go to Properties > Advanced .

The RTL8139D driver is supported on Windows 7, but it may require some additional steps to install and function properly. Here are the key findings:

Download the driver (usually a .zip or .rar file) and extract it to a folder on your desktop.