Windows 7 upgrade killed crossfire/disabled adapter #2

First try card 2 in slot 1 to ensure both cards are in fact working. Second completely un-install all the graphic drivers and re-install the lastest version. If there's no change in your system you should consider backing up all your data and doing a complete install of windows 7. Does upgraded mean you did an in place upgrade to windows vista 64? As this would not be my first choice. Assuming you have an upgrade version of windows 7, you do know you can do a clean install by selecting "custom install" instead of upgrade? I would remove the 2nd video card until after the installation, because I want to be sure the system recognizes the 2nd card, then reinstall the catalyst drivers. Good luck

Thanks to you both. I knew better than to trust an in-place upgrade, but my wife was working on something and wanted to be back up quick so I tried it... I have verified both cards work by disabling them one at a time and successfully using each one. The strange part is that CCC and GPU-Z show the second card as disabled, but device manager shows them as both active. I threw this issue at Dell also, waiting to see what kind of useless canned response I get. I'll continue posting updates as I go in case anyone has this same issue (I know others are getting it from various forums but no solution has appeared yet).

Only problem is if you have a crossfire mobo, then probably no sli on that board.