If Windows resides on a seperate hard drive (in this case being a SATA drive) than grub, then you must use the "map" option to make it think it is on the first hard drive.
map (hd0) (hd1)
map (hd1) (hd0)
That will allow Windows to work with grub, if on a different hard drive. That is what my entry looks like. I have Gentoo on hda and Windows on sda (SATA drive). Grub reads each hard drive as hdx (x being your hard drive number, 0-whatever). IDE hard drives will almost always be before SATA drives.