|Buzzing could be from feedback or maybe some fault with the recording software or audio device or like you said some electronic interference.|
Is this windows 7?
Did it ever work?
Is it new?
What application are you using to record?
Do you have the speakers on at the same time or headphones?
As Mavis007 suggests, if laptop then remove ac while recording.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.