Before adding the drivers.
Make sure that you are adding the correct drivers.
To ensure after downloading the drivers match the Device_ ID & Vendor_ ID in the .inf file.
You can get this information Start-> Run->type msinfo32.exe.
You will get the System Information page.
Select Components-> Network -> Adapter.
You need to locate to Ethernet Adapter type.
In that Pnp Device ID : You can see your network card's Device Id ( dev_Id) & Vendor ID ( Ven_ID).
Once we confirm you can add the drivers and create the WINPE package.
Get us the device id and vendor id will tell you the link to download the driver.
thanks
Sockkalingam.S