First step, remove and reinstall Crossfire. If it doesn't work, do these step.

1. Install/update your graphic card
2. If it doesn't worked like in my case you will need to install the graphic manually
3. Find the graphic card driver and install it
4. Enjoy Crossfire!

Ps: In my case, I needed to install Intel GMA https://downloadcenter.intel.com/Det...&DwnldID=16835