According to Gigabyte, you have a Silicon Image 3112/3152 SATA chip on that motherboard. Below is a link to the Silicon Image support page. Here, under the Product support pulldown you will choose either of the two numbers (3112/3152) and scroll down the list and you will find a driver for Windows 7 for 32 and 64 bit 3x12 chips (where the x is any number). They also say to use the newest BASE BIOS and there are tips to update the chip's BIOS. I've never tried this before, but hope you have good luck!
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