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Go to devmgmt.msc > find your usb sound card (under "Sound, video and game controllers") > right-click > update driver > browse my computer for driver software > let me pick from a list. (You can install this without having any logitech device.) Have your cheap C-Media USB sound card connected You might be able to use Logitech's 7.1 drivers for Windows on cheap C-Media USB sound cards / Headsets - you just have to manually install the audio driver that comes with LGS: Here's a possible gold tip to get 7.1 drivers for cheap C-Media devices and possibly other USB sound devices
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