Downgrading a Sony Vaio AR2 from Vista to XP professional


– Sony Vaio computer which need to downgrade from Vista to XP

– Not fully functional optical drive Matashita (reads only dvd not cd)

– Windows XP cannot find the hard disk during the installation process


The solution of the problem is to install XP with Additional drivers pressing F6 when prompted to. As XP requires a Floppy Drive for this sake, I had to create a separate installation CD for the machine which includes the required drivers. Of course as the Optical Device was not properly working I burned the compilation on DVD.

Step by step (how to):

– download your drivers from Sony my case was VGN-AR21M

– download and instal Nlite

– choose your source (original source of the OS) and destination (en empty folder intended on your c: partition)

– when the dialog appears make sure that you select Drivers and Bootable ISO (if you want you can add other features to your compilation)

– now you have to insert the driver required by XP to see your hard disks, I personally have added to drivers:
    — iastor.inf – Intel(R) 82801GBM SATA AHCI Controller (Mobile ICH7M) depending on your configuration (if you have two disks in RAID volume) you might choose Intel(R) 82801GHM SATA AHCI Controller (Mobile ICH7M/DH)
    — SI3132.inf – Silicon Image Sil 3132 SATALink Controller for Windows XP/ Server 2003

– bur the compilation on a DVD

– install OS