i recently bought a dell xps L501x.i uninstalled the preinstalled windows and installed a windows 7 64 bit which came with my laptop.
the problem i am facing is under device manager in others tab it is showing one "unknown network controller" and an "unknown device".you can see the pictures down here.
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  1. Hello shikhar;

    Windows 7 will update those drives for you. Follow the guidance here:

    How To Update Drivers in Windows 7
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