Windows 7: SIL3132 Raid0 Trouble (won't recognize in Windows 7 installer)

Hello,
Today, I just got a PCI Express raid0 card. My intention is to pair two of my older drives in a raid0 array and run Windows 7 off it. Once I plugged it into my computer, I could see the bios from the card come up on the screen. In my other Windows installation, I was even able to update the firmware and read and write to drives connected to it. So, I connected my two drives (which have identical model numbers) to it, and in the card bios, I set the two drives to be in raid0.



Here's where the trouble comes in: I popped in my Windows 7 ultimate disk (x64), and when I get to the point to choose the directory to install to, the raid0 array isn't on the list! I loaded drivers from silicon's website, but it still doesn't show up. Any ideas?
Thanks!