First check what version of this board do you have.
http://www.pcchips.com.tw/PCCWeb/Downloads/ProductsDetail_Download.aspx?categoryid=1&typeid=5 &detailid=49&DetailName=Driver&DetailDesc=M755&Men uID=0&LanID=0
http://www.pcchips.com.tw/PCCWeb/Downloads/ProductsDetail_Download.aspx?categoryid=1&typeid=5 &detailid=50&DetailName=Driver&DetailDesc=M755&Men uID=0&LanID=0