I suspect the answer is contained in this article: http://community.landesk.com/support/docs/DOC-1157. If you start from the button in the console (manage drivers in WinPE image) and you just go through the motions, without the additional step described in the article, it won't work.
I've also documented all the steps again in the attached document. It doesn't say anything that isn't isn't documented elsewhere, but perhaps it is a bit more readable with all the screenshots. The document is based on 8.8, but there is nothing in it that wouldn't also work in 8.7.
Message was edited by: Jan Buelens - an updated version of the attachment was posted at http://community.landesk.com/support/message/23280. The updated version includes a tool that does all the work for you.
Many thanks Jan,
What a brilliant document and instructions, thanks heaps.
Just curious - did it also solve your problem? ...
Yep - working like a champ now.