Ok Cool, first thing is disconnect the power on the two RAID drives, only leave the 840 Pro connected.
2nd thing to do is download the pre-install RST driver 22.214.171.1246 and the full RST software package put the pre-install driver (extracted) onto a USB key drive. Save the RST package file for later on. (get the two files over at intel downloads under software/chipset software)
Put the Windows 7 DVD into the DVD-ROM drive etc. restart to go into BIOS
In BIOS for a pure UEFI boot youll need to disable CSM module in the boot settings, But if your Video card doesnt have a UEFI VBIOS then youll need to keep CSM enabled and only choose legacy for the GPU section if there is one I cant recall for ASUS boards. Also Disable Secure Boot.
First Boot device choose UEFI: DVD-ROM etc.
Step 1 - At the Windows setup screen choose Load Driver option, and point it to the USB stick that has the pre-install 12.8.x x64 driver, after that has been chosen install Windows as normal.
Step 2 - Once your in Windows Update the system threw Windows Update.
Step 3 - After its all Updated install the Intel Chipset drivers 126.96.36.1996, If on Windows 7 just run the chipset *.exe package to install them. If on Win8/8.1 youll need to update each device manually, For this youll need the extracted *.zip chipset package. Theres about 7 devices youll need to manually update, theres two USB, DRAM, PCI Express Root, SMBus, LPC controller, If your using the x1 PCI-E slots theyll be two more PCI Express ones above the SMBus.
Step 4 - After the Restart install the Intel RST Software package 12.8.x, This is to give you the RST GUI Manager and to enable Write Back caching on your RAID drives.
Step 5 - Install rest of your drivers, I usually am strict on the driver install Order, 1>Chipset, 2>RST Package, 3>USB 3 drivers if applicable, 4>Network, 5> Intel MEI software, 6>Mouse drivers, 7>Sound Drivers, 8>Video drivers
Step 6 - Enjoy