1st you are better to download the intel RST driver from intel website. https://downloadcenter.intel.com/Detail_Desc.aspx?ProductID=2101&DwnldID=23060&lang=eng&iid=dc_rss
Also read the "read me" too. And more info you can read here. http://www.intel.com/p/en_US/support/highlights/sftwr-prod/imsm
Because you use the 2x 2TB for the raid0 ( more than 2.2TB), you may need the asus "Disk Unlocker" http://event.asus.com/mb/2010/disk_unlocker/
You can do by two steps: 1) Set up the SATA mode to RAID, install the win7 into the SSD first, aslo need F6 method install the ahci driver, install the intel RST, and other drivers, etc. 2) Turn off the PC, connect the 2X 2TB HDD, unlocker the HDD, start the RST, follow the on-screen instructions step by step create the raid0. You may need some time to set up those raid0 for the 2X 2TB.