Is there any simple and free method to install all hardware drivers at once and keep them up-to-date?
Windows Update isn't the choice. It didn't find all hardware drivers.
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I recommend you DriverPack Solutions.
It's a powerful, free and all-in-one pack of drivers in one ~3GB DVD ISO.
It always has the latest drivers, and it automatically finds and install drivers for almost all devices.
Also you can use its ~7MB program, which will find and download your drivers from it's base.