I just installed Windows 7 on my m400. It took a while to find the Raid Driver, but like the previous post it is in page three on the toshiba download site. Be sure to chose Windows 7 32 bit as the operating system then go to page three and download the Raid Driver to a USB thumb drive. Plug the thumb drive into the laptop then boot to the Windows 7 DVD. When you get to the window to chose the drive to install it on chose the "load driver" tab. Then browse to the file on your thumb drive and chose next. When the driver installation is complete your HDD should show up. You should be set form there. Remember to browse to the raid driver that is located on your thumb drive in order for your hard drive to be detected.