Thanks for the link, I'll try it out.

We need someone, preferably a company, to develop a new network driver for Vista. But how do I find such companies. Is there a marketplace somewhere? Simply Googling brings up a few possibilities but buried in a lot of unwanted links, and mostly on the wrong (western) side of the atlantic. Any ideas as to where I should look?

We don't keep track, but we supply SCADA systems to users who run 24/7 and those are often based on XP pro (at least for the clients). As far as I know they don't turn them off and they don't keep complaining to us - even though they have service contracts.