I had the same problem after installing some beta drivers to see if i could get crossfire to run. I took the cd with the drivers on it and uninstalled what was on the pc then reinstalled cd drivers.Rebooted got the same message, rebooted again and now is all good! so god know what i did but i...
Recieved this today
ATI Radeon HD 3870 X2 will also provide support for ATI CrossFireX, the innovative next-generation AMD multi-GPU technology designed to support up to four GPUs. Software support to enable ATI CrossFireX is planned for late Q1 2008.
Dont worry I Picked up 2 3870x2 at launch and have now been told there wont be any crossfire drivers for this card until the end of march:mad:
(the drivers that come with the card do not allow crossfire)