You don't want the Gigabyte driver - it's for the MOBO's GSATA (jMicron) chip...
"4.2.2.1 Installation Procedures
The following detailed procedure installing the SATA RAID controller driver while installing Windows 2000/XP/2003/Vista. Have your bootable Microsoft Windows 2000/XP/2003/Vista CD and follow the required procedure below to install SATA RAID controller:
1. Make sure you follow the instructions in Chapter 2 “Hardware Installation” to install the controller and connect the disk drives or enclosure.
2. Start the system and then press Tab+F6 to access the McBIOS RAID manager. Use the McBIOS RAID manager to create the RAID set and volume set to which you will install Windows. {For details, see Chapter 3 “McBIOS RAID manager”. Once a volume set is created and confgured, continue with next step to install the operating system.}
3. Insert the Windows setup CD and reboot the system to begin the Windows installation.
4. Press F6 key as soon as the Windows screen shows ”Setup is Inspecting your Computer’s Hardware Confguration”. A message stating “Press F6 to Specify Third-party RAID Controller” will display during this time. This must be done or else the Windows installer will not prompt for the driver for from the SATA RAID controller and the driver diskette will not be recognized.
5. The next screen will show: “Setup could not determine the type of one or more mass storage device installed in your system”. Selected “specify additional SCSI adapter” by pressing S.
6. Window will prompt to place the “Manufacturer-supplied hardware support disk” into foppy drive A: Insert the SATA RAID series driver diskette in drive “A:” and press Enter key.
7. Window will check the foppy; select the correct card and CPU type for your hardware from the listing and press Enter key to install it.
8. After Windows scans the hardware and fnds the controller, it will display:
“Setup will load support for the following Mass Storage devices:
ARECA [Windows X86-64 Storport] SATA/SAS PCI RAID Controller (RAID6-Engine inside)”. Press Enter key to continue and copy the driver fles. From this point on, simply follow the Microsoft Windows installation procedure. Follow the on-screen instructions, responding as needed, to complete the installation.
9. After the installation is completed, reboot the system to load the new drivers/operating system.
10. See Chapter 5 in this manual to customize your RAID volume sets using McRAID storage manager."
I placed the Win7x64 drivers here for you:
http://www.mediafire.com/?jyoyf1mmxtg
Just unzip the entire file to a floppy, if you have one (Win7 will automatically 'look' there), or a thumb drive (if you have no floppy drive - you will have to 'navigate' to it...), and you should be good for the install as above. The Win7 drivers are 'beta' at this point - no WHQL cert yet, but should be OK... Post back if you still have problems.
Good luck!
Bill