#1 You do not need RAID. Changing to RAID may have made Windows non-bootable if the iastor/iastorv driver was not enabled in the registry. http://support.microsoft.com/kb/922976
#2 All Intel RST drivers from 13.x and above DO NOT support 6 Series Chipsets under AHCI.
As far as I see, if your "Intel(R) Desktop/Workstation/Server Express Chipset SATA AHCI Controller" is using RST driver 10.0.0.1046, that corresponds to device ID: PCI\VEN_8086&DEV_1C02&CC_0106
Using that information, I don't see why the bare driver will not install. All RST drivers from your current version to 12.9.0.1001 contain that device ID (PCI\VEN_8086&DEV_1C02&CC_0106) in the iaahci.inf/iaahcic.inf
Did you:
"Search automatically for updated driver software" when you tried to install the driver within Device Manger?
If you did, that option will not find a driver in some random folder on your PC.
You have to do one of these:
Browse my computer for driver software > Browse... > Choose your new RST driver folder
OR
Browse my computer for driver software > Let me pick from... > Have Disk... > Browse... > Choose your new RST driver folder > iaahci.inf (iaahcic.inf if using a newer driver than 11.2.0.1006)
11.2.0.1006: https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=21854&lang=eng
Use "f6flpy-x64_11.2.0.1006.zip" for the bare driver.
12.9.0.1001: https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23496&lang=eng&ProdId=2101
Use "f6flpy-x64.zip" for the bare driver.
I'm still unsure as to why the setup program for the RST is not working for you...
Also, when you go to format the new disk within Disk Management, make sure you initialize the disk as GPT and not MBR: http://support.microsoft.com/kb/2581408