Does Microsoft have a central driver repository that you can point the driver installer to?

If the drivers have passed WHQL and are properly signed, then they might be downloadable from http://www.microsoft.com/downloads/search.aspx?displaylang=en&categoryid=3

They'll also, under certain circumstances, appear in Windows Update (though I think you'll need to already have an earlier copy installed).

And if the original company doesn't make it easy to find drivers, then contact their support people and point out that you'll not be buying any more of their products again.