How does the 4850 act in his PC?
Does he have the same Board? Even AMD?
I own both a Palit and an MSI 4850.
The Palit was a prize, the MSI a gift.
He has the Palit in his Intel board, works fine.
The MSI I was using, and it worked in my Fatality board and has never worked right in this MSI board, could be due to me snapping off a screw while trying to tighten its GIANT fan shroud that was always loose... either way I have only been getting those errors with the MSI 4850.