HI,
go to your device manager and see can you see some devices named " unknows devices"
if yes then >
Try following some steps
go to your device manager > right click on unknown devices > go to Properties > then Details tag
select from drop down list called Hardware ID's (PCI\VEN...) Copy it via right click...
and search it according to it on google or any serch engine you will get the right drivers..
here are the print shoot of process!
Hope it helps!