have you connected the crossfire bridge? if so then reinstall the ATI drivers, if it still doesn't work then sell the ATI cards and get some nvidia cards, they run much better
Man quit being such a douche. I've read 4 or 5 of your posts in the last 10 minutes that say sell ATI/ATI sucks/Nvidia is my lover.
OT: First thing to do, obviously, is plug the cards into their respective slots. Make sure your DVI/HDMI/Display Port is (are) only plugged into the top card. Then connect one CF bridge to link the GPUs. Boot up. Open CCC and go to the Crossfire tab. Enable CF by clicking the checkbox. Hit Apply. Screen should blink. Hit ok. That should do it. You'll also want to download the Crossfire Application Profiles from ATI (on the same page as the newest drivers). Also, if you have an app like Afterburner open when you enable CF, you'll need to restart it.
I hope this helps.