Never use auto settings for memory, always set it manually just to be sure. Check what voltage your memory requires, it may require 1.6 or 1.65V, auto would set it to 1.5V so it would have a hard time trying to keep two stick stable.
LOL, I love tech support. So assuming the memory divider is the thing thats broken, why send in the board? The memory controller is on the CPU. Upping the NB voltage might help, but you shouldn't have to. Make sure the CPU temps are ok, and the Vcore is where it should be. If the temps are good and the CPU is getting the voltage it needs, the memory controller is probably bad. This is found on the CPU and not the board. I'd try to get the RMA.
Is this a new OS install that is on the harddrive or an old windows instal,that you are trying to boot new hardware with?
If it is the old windows install on new hardware it will almost never work. Windows is trying to load drivers for your old hardware not your new hardware.
If this is the problem try booting in safe mode. Uninstall all of the old hardware ,leaving the usb hubs for last. so you don't lose mouse and keyboard function before you are done.
Now reboot to the windows cd and do a repair install.
The above strategy works somewhat but it is best to do a new windows install.
When you having this problem, was all the parts mounted inside the case? Have you tried to test all the components on the bench? Believe or not I have seen people mounting the mobo directly on the case and not using the brass risers. So put the mobo on a bench and plug in the CPU, memory and graphics card. See you can find out what is wrong. Depending where you live you might be able to get the parts to test and return them to the store.