Thanks Phreak ,yes I have done all of those things,running it at absolute minimum gfx settings,and i've checked the other things,thanks for advice.
To Farleito,I have exactly the same problem you had ,bought 2 gfx cards thinking I could XFire them,turns out as you said,wow wont do xfire/sli o.0 real shame.
I will be ordering up 2x quad cores in the next few weeks,and am sure it will sort the problem out for me.
Many thanks m8 and to all who have given me advice,much appreciated.
[I'll post the results here and in your thread Far*].