Greetings from Poland;)
I found solution today:
First uninstal all audio drivers
Next instal from site: http://www.realtek.com.tw/downloads/downloadsCheck.aspx?Langid=1&PNid=24&PFid=24&Level=4&Conn=3&DownTypeID=3&GetDown=false#High%20Definition%20Audio%20Codecs
(now you can use your headphones...