I have windows 7, and my computer is fairly new (9 months) I have never had a problem with it before, then last week, Avast (free) all of a sudden started popping up with warnings about every 5-20 seconds that it blocked something malicious. I ran Avast antivirus, malwarebyte, and Kaspersky, but found nothing. I installed updates, on everything, still couldn't find the problem. The next morning I began getting random sound from my speakers, sometimes music, sometimes what sounded like cooking show segments, and someone comparing the fashion on madmen. sometimes more than one program would be talking at the same time. Always sounded static-y like it was getting a bad connection. Only stopped when I turned off my wireless modem. A friend who does tech stuff for a living and knows more than I do (I thought) took it over the weekend and ran some anti spyware stuff, said he couldn't really find much wrong. I got it back today, and the random speaker issue is still driving me nuts. I took avast off and put Microsoft security essentials, so no more avast pop-ups but what is going on?
I have tried running rkill, then tdsskiller, then malwarebytes in that order both in normal and safe modes, but nothing comes up wrong. What is wrong and What do I do?