On the work iMac and it is the second system installed Windows 7. Everything works fine, except that there is no sound. In device Manager the sound card is found and in properties it is written that "this Device is working properly". When updating drivers says they do not need to be updated. What is the strangeness that the Manager 2 sound devices: http://prntscr.com/2419e9 Tell me how to solve this problem?
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