The Dell Support (PC Doctor) program updated itself on a few of my machines and suddenly I have the same issue. I uninstalled Dell SupportAssist and the SupportAssist Agent and the problem disappeared. Might be worth a shot if you have this program installed. 
I have a DELL Inspiron and just today I noticed that while playing video from Youtube or other online video sites like Bliptv, the video will randomly stutter and emit a loud buzzing sound. There's no rhyme or reason to it, and my computer doesn't appear to be overheating at all. Can anyone help with a possible solution to this problem?
Video stutters and audio buzzes.