update driver on 4870x2

well I updated my drivers on my 4870x2,when I restarted my system a pop up said Folding@home run into a serious problem and had to close.I don't really know what the problem is.I went back to the orignal 8.12 driver and every thing is working again.Any ideas on why folding won't work with the new 9.4 driver would be helpful