ive not seen a sata drive detected in the main system bios.... there should be a second sata controller bios that you see when you boot your system... enter that and then check your sata drive.
also, in order to install windows onto a serial ata drive you need to have a floopy disk of drivers for your sata or raid controller... with the disk inserted into the system and booting from your windows cd you should see a text prompt at the bottom about specifying a device or something like that by pressing F6... do this and choose the sata/raid controller thats in your system.
That should set you well on your way