When I Try to stream programmes or even play dvd on my laptop, I hear loud music which is unrelated to the subject. After a while, the music faded and I can hear the soundtrack of the stream or DVD, but the volume is minimal and there is a distinct echo. Prior to yesterday my system was normal. What advice and what can cause this problem. Is it a virus?
I doubt it's an infection. Sounds more like the settings on your sound card or even the internal connections maybe?
You could try System Restore to before this happened, see if it helps?