1. Download the BIO003XP.EXE file to a temporary or download directory (please note this directory for reference).
2. Go to the directory where the file was downloaded and double-click the BIO003XP.EXE file to begin the installation. Several setup boxes will briefly appear as the files are extracted and the notebook model is identified. As these processes complete, the boxes will close automatically.
3. At the "Setup Needs The Next Disk" box, insert your prepared 3½ bootable floppy disk into the drive.
4. Click OK to begin copying the BIOS files onto the bootable floppy disk.
5. At the "BIOS Ver. 1003 Upgrade for Microsoft® Windows XP" screen, click Finish. Leave the bootable floppy disk with the BIOS files in the floppy drive. As the computer restarts, it will boot from the floppy disk instead of the hard drive.
6. At the "Do you want to update BIOS(1003) for [Computer Model]" prompt, press the Y key. The Sony BIOS Flash Program will launch and start the BIOS installation. Please wait as the installation of the BIOS will take one to two minutes to complete. Once the installation is complete, the computer will automatically restart.
7. At the black VAIO screen, eject the bootable BIOS installation disk from the drive.
8. At the "CMOS Checksum Error - Defaults loaded. Press F1 to continue, F2 to enter SETUP." prompt, press the F1 key. This message is normal and will only appear after the computer restarts for the first time.

After the computer restarts, the installation of the BIOS is complete.

BIOS Update Utility, revision 1003, for the Microsoft® Windows® XP Home Edition Operating System.

• Please read the Sony Windows® XP Upgrade Information page, if the computer will be or has been upgraded to the Windows® XP operating system. If the new operating system is not installed or configured correctly, some updates may not install properly.
• Before installing this BIOS revision, you will need to prepare a 3½ bootable floppy disk to receive the BIOS installation files. For additional assistance, please see Creating a Bootable Floppy Disk for Windows XP BIOS Updates.
• Before installing this BIOS revision, you will also need to have the floppy disk inserted in the computer's floppy disk drive.
• For Windows XP Upgrade systems only: During the installation of this update, be sure that you are logged in as the Administrator or as a user with Administrative rights.
• To ensure that no other program interferes with the installation, save all work and close all other programs. The Taskbar should be clear of applications before proceeding.
• It is highly recommended to print out these instructions as a reference during the installation process.