you probably plugged in the s4 before installing traktor... which instructions say not to do. keep S4 unplugged until driver is installed.
http://co.native-instruments.com/ind...tor_Kontrol_S4
scroll down and download latest driver.
or... DL the service center...which should have installed with traktor( or may just have to DL off site, cause you need service center to input your traktor serial), and then in update section you should be able to drop down drivers/devices or something and download/update in there as well.
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