I had a problem doing a clean install of Windows 7 with my motherboard, which also contains a sil3132 SATA controller.
Windows 7 could not see the controller, and therefore not the drives. I asked ABIT for help, but as yet have received none.
I solved this by dowloading the latest driver from the Silicon Image website. I was installing the 64-bit version.
This driver contains two directories, one called AMD64 and the other IA64. When I selected IA64 (Intel??) Windows could see no valid drivers, but when I tried (in desperation) the AMD64 directory it seemed to find the driver I needed ???
My system is Intel, not AMD ... so I can only guess that Silicon Images have put the drivers under the wrong categories.
Using this driver I successfully installed Windows 7