Sony Vaio VGN-CS26G originally released for Windows Vista. However Sony also release drivers and software if you plan to upgrade it into Windows 7 or downgrade it into Windows XP.
Installation:
1. Please Install according to order.
2. If you upgrade windows 7 from Windows Vista. Please read the instruction at the end of this post. Clean windows 7 installation, Windows XP just proceed and install all drivers listed here.
4. Please read License/T&A : Nvidia, Sony
5. Windows Vista drivers available on Sony asia download page.
Windows XP Drivers
For windows XP, download and extract the driver/application file to install.You can use winrar or 7zip software to unpack these drivers package.
Drivers
Complete Windows XP Drivers Pack
Size : 239MB, feb 6 2009
Download
Utility and Application
Complete Windows XP Applications Pack
Size : 56MB, feb 6 2009
Download
Windows 7 and Windows 8 Drivers
Note: In case you use windows 7 or windows vista drivers for windows 8 and the installation was unsuccessful, re-install it incompatibility mode.
Chipset Driver
Intel Chipset Installation Utility For Microsoft Windows
(Sony does not mention this drivers in the upgrade guide, but I believe chipset driver is important).
Windows 7/8/8.1 : Download
Graphics Driver
Nvidia GeForce 9300M Graphic(9M series)
Windows 7/8/8.1 (32-bit) : Download
Windows 7/8/8.1 (64-bit) : Download
Audio Driver
Realtek High Definition Audio Drivers
Windows 7: Download
Windows 8/8.1 : Download
(Windows 8 : tick on "I accept to the above to proceed, then select windows 8 from the list)
Wireless LAN Driver
There are 2 available wireless drivers, choose base on your specification.
Atheros Wireless LAN Drivers
Windows XP : Download
Windows Vista: Download
Windows 7: Download
Windows 8/8.1 : Download
Intel Wireless LAN Driver
Windows XP : Download
Windows Vista: Download
Windows 7: Download
Windows 8/8.1 : Download
Ethernet Driver
Marvel Yukon 88E80XX PCI-E Fast Ethernet Driver
Windows 7 : Download
Windows 8 : Download (Select Windows 8 Installer from the list)
Bluetooth Driver
Windows 7 : Download
Note: After executing the installer, please manually install the setup.exe in C:\Upgrade\Drivers\Broadcom
Windows 8 : (Use windows 7 drivers).
Latest Drivers : Go to download page
TPM Infineon
Sony Trusted Platform Module
Windows 7 (32-bit) : Download
Windows 7 (64-bit) : Download
Windows 8 : (Use windows 7 drivers).
SD Card Driver
Ricoh SD Bus Host Adapter
Windows 7 (32-bit) : Download
Windows 7 (64-bit): Download
Windows 8 : (Use windows 7 drivers).
Memory Stick Driver
Ricoh Memory Stick Host Controller
Windows 7 (32-bit) : Download
Windows 7 (64-bit) : Download
Windows 8 : (Use windows 7 drivers).
Fingerprint Driver
(only applicable to models with Fingerprint Sensor)
Windows 7 (32-bit) : Download
Windows 7 (64-bit) : Download
Windows 8 : (Use windows 7 drivers).
Pointing Driver/Touchpad
Synaptic Pointing device driver
Windows 7 (32-bit) : Download
Windows 7 (64-bit) : Download
Latest Windows XP/Vista/7/8/8.1 : Download
Protect Suite QL
(only applicable to models with Fingerprint Sensor)
Windows 7/8 : Use Windows Vista Drivers : Download
Sony Firmware Extension Parser (SFEP Driver)
Windows 7 (32-bit) : Download
Windows 7 (64-bit) : Download
Windows 8 : Use windows 7 driver.
So, the list above is what you need to install after windows 7 installation. If you need the application which you have in windows vista, just re-install it in windows 7 using compatibility mode.
Do let me know if you have problem with the installation.