Hey m8
I experienced the exact same problem (With Windows 7), and the solution for me was to install Lucid Virtu Software.
I found it on my motherboard manufacture support site when I search for drivers. It was in the
category Utilities for my Asus motherboard.
So I installed it, and that solved the problem.
So go to your motherboard manufacture support site and search for it.
Or try Lucid Virtu Software @
http://www.lucidlogix.com/driverdownloads.html
The one I installed was Lucid Virtu v1.2.112
Sethos