Problem with my Gateway gm5664

I've followed the instruction on the first post. It seems like my problem is with the SATA drive on my machine which was recognized as a read only device. So can not partition or format the drive at all. I have the nvdia geforce6150se/nforce 430 graphic. Here is the spec
http://support.gateway.com/s/PC/R/1015004R/1015004Rsp2.shtml
Where can I find a driver for this chip set? Any help is greatly appreciated.