I had an HP Pavilion dv9000t with window vista, and I tried to add window 2000 on it as a dual boot machine. After I did all the disk management, and download all the driver for window 2000, I did a reboot using window 2000 CD trying to install 2000 on drive E:. In the process of installation, it says it cannot find any hard disk. My guess is due to the SATA hard drive, but cannot figure out a way to solve the problem. Just wonder if anyone has the same problem. I talked with HP and they suggest to me to change the BIOS setting and to disable the SATA native support, and then I was able to see the drive. However, all the three NTFS partitions on the drive are listed as unformatted or bad file systems. Further, only the first partition has a drive letter C: and the two other partitions with drive letter D: and E: in window vista are not showed. Further more, when I continued and selected the third partition for the window 2000 operating system, it asked to reformat the C: drive, and I was not sure if the operating system will reformatted the whole disk drive with three partitions on it or just the third partition which I selected for installation. Need help!