If your board is a H97m pro4 then it should be an ASrock motherboard. and not a Asus dont make a board with the pro 4 suffix.
Have a double check. on the brand.
If it is a ASrock board,please click on the link bellow, select your os and it`s bit version.
The Lan driver is there for you to download for your board.
http://www.asrock.com/MB/Intel/H97M%20Pro4/index.asp?cat=Download