Originally Posted by
Kriz
I've seen machines do wacky audio things when they were rootkitted, I don't know what you ran but I'd suggest ComboFix in addition.
Windows has, under Sounds and Audio Devices properties, program event sounds. I'd check there as well.
Are the computers accessible by other people? Do you use a USB flash device between them?
If you reformat a machine and never touch it, then how are you installing, a base image? Or fresh?
I really want to say it's Windows going stupid and grabbing WAV files and associating them with program events. You say it plays the FFXI delevel sound, that kind of eliminates a lot of things (random viruses). Do you hear the FFXI delevel sound on a machine without FFXI? Lord knows MS ships Windows with some weird music-like files that may be the music you hear.