Change from SATA IDE to AHCI without reinstall
 

Yes this is possible, I did it last night after reading several different
sources and being told that if I didn't install the SATA AHCI drivers by
doing the F6 thing during windows install that it was necessary to reinstall
windows. I almost wept as I'd just spent days installing windows, drivers,
software etc. I found the following method,slightly modified it and it
worked!!
Here is my system:

GA-EP35C-DS3R
E8400
2GB Kingston RAM
Seagate 80GB SATA II
Samsung 750GB SATA II
Samsung 500GB in E-SATA enclosure
Pioneer 212 SATA CD/DVD

This method worked for me.

Extract the driver for an F6 floppy install and save them in a folder on C:\

1. Power down the PC

2. Swap the C:\ HD SATA cable from the Intel SATA controller [Yellow SATA
sockets] to the Jmicron [Purple SATA sockets]

3. Power on PC and enter the BIOS

a. Ensure the Jmicron is using IDE mode, next set the now Jmicron attached
HD as the default boot disk.
b. Switch the Intel controller from IDE to SATA AHCI mode
c. Save BIOS settings and allow the PC to boot into Windows

4. Windows now auto-detects a new SATA AHCI controller has been found

5. Direct the Windows driver update wizard to the driver location and
install, next Windows should ask to reboot.

6. Reboot and allow PC to go into Windows, check that the Intel SATA
controllers are now in AHCI mode.

7. Power down and swap the HD SATA cable back from the Jmicron to the Intel
controller.

8. Power up, enter BIOS and set the now Intel controller hosted HD as the
default boot drive.

9. Save BIOS settings and reboot into Windows with AHCI now activated,
enjoy.