I know this issue is old and it's related to Windows 7.
Had some issues clean installing Windows 10 on my old Gigabyte X38-DS4 which can use SATA AHCI native on the ICH9R southbridge.
So here goes. Since I found what works. Cannot attach my own files here, so you'll have to download externally.
This guy @ http://www.win-raid.com/t29f25-Recommended-AHCI-RAID-and-NVMe-Drivers.html is pretty cool.
If you want SATA AHCI Native mode on Windows 64-bit:
1. Universal 64bit Intel RSTe AHCI+RAID drivers v220.127.116.110 mod+signed by Fernando.rar
2. Universal 64bit Intel RST Software v18.104.22.1680.rar
*** For X38-DS4 SATA AHCI Native mode on Windows 10 ***
* The southbridge SATA controller on the X38-DS4 is Intel ICH9R *
1. When fresh installing, place the drivers on a USB/Floppy drive and install them when setting up your installation of Windows 10
>> iaAHCIC.inf = AHCI Mode (What I use. No RAID)
>> iaStorAC.inf = RAID Mode
2. When Windows boots ensure that the IDE ATA/ATAPI controllers >> Sata Driver is actually listed with ...added by Fernando (at the end).
>> If it isn't, first run Win-RAID CA Certificate\ImportCertificate.cmd as admin and do that, then update the driver manually selecting iaAHCIC.inf for AHCI mode.
3. Install the RST Software "Universal 64bit Intel RST Software v22.214.171.1240 (RST_x64).exe".
Notes: Stick with v126.96.36.1990, as it supports the X38-DS4's southbridge ICH9R, thanks to Fernando's mod.
Windows will probably never provide an update for this old Intel SATA controller. So stick with what works and smile if it works as it should.
You may have been successful installing windows in SATA AHCI native mode without another driver? I had problems and spent a night resetting my Gigabyte X38-DS4's BIOS with a screwdriver.
If you have problems with an error 23 at SATA BIOS, reset your BIOS via two pins near battery on mobo and do this...
1. Leave your BIOS set to IDE (usually BIOS default)
2. Start Windows installation. Just delete the partitions when you get to that and then power off (use the switch on PSU or pull the plug)
3. Hold DEL and get to BIOS. Set SATA on with AHCI and SATA Native mode.
4. Reinstall Windows (use that USB stick with Fernando's modified intel inf during setup)
Hope this helps someone,