Safe way to find drivers would be to use the hardware ID and go to this site
http://pcidatabase.com/open Device Manager, right-click on the listing for the Unknown Device, select Properties from the context menu, and then click on the Details tab at the top of the resulting window.
On the Details tab, you’ll see a drop down menu labeled “Property”. The items listed in that drop down menu will offer up a wealth of information about the mysterious device. Select Hardware IDs from the drop down menu and the “Value” field below will populate with a list of values.