Download drivers or the manual here:

http://www.pcchips.com.tw/PCCWebSite/Downloads/ProductsDetail_Download.aspx?detailid=297&DetailName=Driver&DetailDesc=M909G%28V5.0A%29&CategoryID=1&MenuID=39&LanID=0

One of the ram modules, could have a fault.

Try with one in the slot, at the time.

Look in the device manager, for any files missing.

Good luck