1) System: i5 3570K GTX 660 Ti Asus p8 Z77 v-le 8 gb Ram, SSD and so on.
2) Buzzing happens in every kind of speakers or headphones I use so it is independent from the device I use.
3) There is no buzz or strange sound until windows starts.
4) I tried different AC outlets no help.
5) Buzzing...