Vista - Network adapters, netsh and WMI problems

Hi, I'm currently having difficulty using "netsh" in vista. I've recently migrated from XP where I had no problems. The first problem is that I'm trying to manage the ip addresses attached to various network cards, simply by adding and deleting, I am not able to add IP addresses to the network cards I want, instead the addresses keep getting added to the interface named "Loopback Pseudo-Interface 1". These additions can be viewed using "netsh int ipv4 show ipaddresses", but not using "ipconfig". I can add alternate IP addresses to network cards via Network Connection, Properties, IPv4, Advanced, and view them using both methods described above.

The second problem is that after a while when attempting to add an IP address I keep getting the following error,

netsh interface ipv4>add address "Network Connection Name (i.e. Local Area Connection 1)" 10.254.254.20 255.0.0.0
Failed to configure the DHCP service. The interface may be disconnected.
The system cannot find the file specified.

I am able to specify "Loopback Pseudo-Interface 1" as the network connection name
with the add and delete, and I never get the error when I'm deleting IP addresses even after the adding started to fail. The state of the interface has not changed and the error persists if I disable and re-enable the network card, or if I pull and then re-insert the network cable.

A third problem I have, although I do have a possible work around, is that when attempting to discover the network settings of my PC programmatically using WMI, the WMI database does not seem to have any knowledge of the "Loopback Pseudo-Interface 1" interface or any of its IP addresses in the Win32_NetworkAdapter or Win32_NetworkAdapterConfiguration instances. My work around is using MIBII (Management Information Base) to obtain these properties, but its undesirable.

Is there anyone out there that has a good understanding of network adapters and can help me with these problems,

Thanks,

Ollie