Hi,
when installing Windows 7 and it gets to the "Missing Driver" stage you need to navigate to the correct driver which for the 64bit OS is inside the RAID_w7 folder then inside that, the subfolder called W764A.
I have struggled with this myself and I think it is made even more confusing as the actual RAID driver is labelled as "ahcix64s".
EDIT: Removed your duplicate post in the other thread to keep things tidy - absic