ManagementException: Provider loading failed while accessing Win32_NetworkAdapter

Question

Possible duplicate:
How can I resolve the "Provider loading failed" for WMI requests?

When I try to access the Win32_NetworkAdapter table, I get the following exception:

Fix System.Management.ManagementException: Provider Download Failure Error

This is how I tried to access it:

 ManagementObjectSearcher mos = new ManagementObjectSearcher( @"SELECT * FROM Win32_NetworkAdapter WHERE Manufacturer != 'Microsoft' " + "AND NOT PNPDeviceID LIKE 'ROOT\\%'"); var managementObjectList = mos.Get(); // Exception: foreach (var networkAdapter in managementObjectList) { } 

So I get an exception:

 ManagementClass mgmt = new ManagementClass("Win32_NetworkAdapter"); using (ManagementObjectCollection objCol = mgmt.GetInstances()) { // Exception: foreach (ManagementObject obj in objCol) { } } 

I also get the same error when I try to open Win32_NetworkAdapter instances using WMI CIM Studio

What could be causing this and how can I make it work reliably?