Yep its a fresh install of Windows 7 x64 sp1 Enterprise
Can go for days without a problem, then come back to the machine the next day and turn it on and no network adptor shows in device manager.
You then have to shut down and pull the power on the machine, plug it back in and its all go to go for afew more days.
This is my second GA-X58A-UDR3 the first one never had the problem.