CCC and crossfire problem(HD3870)...!!

Hello everyone!!I had installed one HD3870, 3 months ago and the last 2 weeks, when i bought a second HD3870 itried to connect them in crossfire mode but catalyst always shows in crossfireX menu that:'' your system is not fuctioning at optimal performance.Please go to the diagnostics page for a more detailed analysis.''As a result Catalyst does not show me the option Enable/Disable Crossfire.I get the same message in Vista 32bit or Vista 64bit.On the other hand i have made some tests through 3Dmark but the results a little above the ones with one card but not satisfiting.The temperatures of both GPU are high when i use 3dmark but in vista menu the primaru card is only working.I have installed both crossfire bridges.So the question is what can i do to fix crossfire because it's vey tiring trying to figure out which is the best way to install crossfire.(a guide like,whether to install both cards and then the drivers or first the primary card then isert the other and so on.)Any help will be appriciated!!!

my rig:
Gigabyte GA-X38-DQ6
Inel Core 2 Duo E6750 2,66MHz
4x1GB corsair dominator PC 8500 1066MHz
PSU:thermaltake 750W