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Can I use the 32 bits version of my drivers on a Windows 7 x64 machine?

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No, you cannot. You will need to find 64-bit drivers for your devices. From Microsoft's FAQ:

If I'm running a 64-bit version of Windows, do I need 64-bit drivers for my devices?

Yes. All hardware devices need 64-bit drivers to work on a 64-bit version of Windows. Drivers designed for 32-bit versions of Windows don't work on computers running 64-bit versions of Windows.

To learn how to check for drivers, see Update a driver for hardware that isn't working properly or go to the device manufacturer's website. You can also get information about drivers by going to the Windows 7 Upgrade Advisor webpage.

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+1, precise solution from the horse's mouth. –  DCookie Apr 3 '10 at 17:26

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