This is Sony's general recommendation on order of driver/utility install, it may be a little out of date but should provive some guidance.
BIOS update (if available)
Intel® Chipset (if applicable)
Sony Notebook Control (if applicable)
Sony Programmable I/O (if applicable)
Sony Shared Library
Video
Audio
Modem
Network
Wireless
MPEG
Memory Stick®
Memory Stick Registry
UPEK TouchChip Fingerprint Coprocessor
Infineon® Trusted Platform Module
Wireless Keyboard and Mouse utility
SmartWi™ Utility
Cingular Connection Utility
WWAN driver
Any other Sony Utilities
To install each driver package, double-click the driver update executable file. Follow the on-screen instructions. Most drivers require that you to restart your computer at the end of the installation.
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