If it were my PC, I'd uninstall all the drivers of the same name, then reboot. That's a "Hail Mary" play though, and it's not my computer. LookinAroundknows a lot about drivers. Why don't you scoot him a PM and see if he can help. This is getting to the point where I'd wipe the computer, and reinstall Windows. S*** builds up over time, by virtue of years of software changes, Windows updates, and file corruption. But again, I'm not recommending this, just giving MHO. The point of the M$ sound driver escapes me, unless it's there for Windows sounds. Normally, most multi-channel audio is (also?) managed with devices and drivers from Realtek Corp.