Welcome to Seven Forums.
If we could get you to please fill-in all your system specs here
If you need help finding them you can use ine if theseprograms to help
Speccy |MG| Speccy 1.08.218 Download
HWiNFO32 3.67v |MG| HWiNFO32 3.67 Download
Once we have all this information we'll know more about your system and possible suggestions to try. I will however tell you that your not the only one having trouble with the XFI Fata1ty cards.
You can also scroll down on any page you post a problem on and see other simular problems and suggestions.