SOURCE: sony vaio VGN-SZ430N/B
I'd suggest ring back Sony support and tell them that your OS is Windows 7 - not Vista. Therefore, you need the upgraded VGA driver because the Vista driver is incompatible with Windows 7. Hope it all goes well. If my suggestion works for you, please do rate me. Thanks
SOURCE: sony vaio vgn-sz430n cooling fan how to replace it
Below is a link to the official Sony Vaio VGN-SZ430N Disassembly and Assembly manual. It provides step-by-step instructions for disassembling your Viao notebook to replace the fan. Please note, however, that this process is quite complicated and should not be attempted unless you have considerable experience servicing computers. You WILL need to almost completely disassemble your machine to perform a fan replacement. If you have any hesitance at all about this undertaking, consult with a professional before starting.
Here is the link: http://home.comcast.net/~nw_systems/vgnSZ.pdf
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