Update bios asus p5k windows 7 64 bit - Drivers - Windows 7

How do you update the BIOs on the asus p5k motherboard running windows 7 64 bit? ... Hi I've installed Windows 7 professional 64 bits in a PC with an Asus P5k motherboard. When I try to switch off the PC the fans don't stop moving and the only way to stop

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