I have Windows 7 64-bit, I use Chrome and Firefox with the free versions of avast!, MBM and SAS. About 5 minutes ago I heard random garbled audio playing I couldn't see which tab was playing sound. I closed a few I suspected and haven't heard it since but I want to be sure. I haven't done a virus/malware scan in a while because I've been very busy but since I'm not seeing any other infected behavior or pop-ups from avast! I wonder what I heard. I've been cleaning up dead bookmarks and old saved tabs so it's possible I picked up something again that I managed to delete before? I just want to make sure it's not a rootkit or something worse because I've had that before and it wasn't fun.