compact flash disk all work except sandisk

I use a lot a CF II cards of different makes for transfering images from my Cannon EOS 350d. Most of my CF cards work fine but Vista refuses to load drivers for SanDisk cards but is happy with any other make. My SanDisk cards work fine on XP pcs.
SanDisk do not supply drivers as they (quite rightly) say I shouldn't need them with Windows. I have tried manually loading drivers, forcing windows to use disk.inf, etc to no avail.
Anyone any ideas?