dual video cards ati crossfire

Hi MS, this is maybe more of a question/concern. I have a AMDX2 4200+, Sapphire Crossfire Advantage, 2 x ATI X1600XT PCIExpress and 1Gb Memory system. Vista fails to install with this configuration. a Bluescreen comes up just during the Finilization of installation, but is so quick with the reset I can not see what the problem is. So I took out my seconday (slave) ATI Card and bob's your uncle Vista installs fine. I installed ATI driver LHR0 works fine. So installed the secondary (slave) ATI Card and Vista goes ape. :). I would love to see suggestions of how to overcome this or if this is a known problem. Thanks,
Keep up the great work :)
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