Thanks, but the problem is, even though all our hardware uses the same card (or revisions/adaptations of), the registry location for this card setting is not predictable enough to be used in a script.
This article is apprantly vbscript for doing this via WMI. http://groups.google.co.uk/groups?q=wmi+nic+speed&hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=eI5Oh8%24XDHA.1744%40TK2MSFTNGP12.phx.gbl&rnum=1
I was hoping that this was genuine and that there would be a simple way to do this in kix.

Thanks anyway,
malek