Hey Fernando, First of all I truly admire and appreciate the work you've done here! Now I have one question I think you might be able to help me with, I have an MSI X79MA-GD45 board with 2 HDD's running Win7 on one and XP64 on the other. I've already got both OS's loaded (and the bootloader works fine in selecting each one), but I still need to switch,via bios, sata mode between IDE and AHCI each time I want to boot in the respective system (win7 BSODs when sata is on IDE mode, XP BSODs when it's on AHCI mode). Basically, my question is, how do I go about installing your modified 64 bit AHCI driver under Windows XP 64 ALREADY installed? I'm past the point of slipping it to the install disc. Any help would be much appreciated, keep up the good work sir!