Please post the full model number of your motherboard. If you are not sure about the model number post the HWID of the LAN adapter. Follow the instructions below to find the hardware id of your LAN adapter.
1 ) click start and on the search box type DEVMGMT.MSC
2 ) Open the device manager. Now you will see either "Ethernet controller" or "network controller" in yellow question mark.Right click on it and select properties. Below picture illustrates finding HWID of audio device.
4 ) Select Hardware ID by expanding the Device description Drop down menu.
5 ) Then here you found your hardware ID which circle in red as shown in pic below. (The ID below is for my Desktop, REALTEK Audio so it difference with your ID).
6 Right click and select COPY (you can alsopress CTRL + C to copy it.)
Follow the above example and post the HWID of "network controller" and also specify the edition of Windows 7 you installed (32 or 64 bit ).