I have installed Windows 7 on my PC (Gigabyte ga-p55-ud5) with the SATA controller set on RAID mode. After that, I've decided to try to install Mac OS X and to do so I had to set my SATA controller to AHCI.
Windows 7 only starts if I set it to RAID, Mac OS X only if I set it to AHCI.
Is there any way to let Windows 7 boot in AHCI mode without installing it from scratch?