You can safely keep ASIO4ALL on the system when using an aftermarket sound device that has its own sound drivers.

I do it all the time, and have for years on the laptop. That way, if the USB sound device isn't along on the trip, I just select ASIO4ALL to use with the built in sound.

When you are trying to hear ASIO with the USB device, what exactly are you selecting in the Audio Window?

Last edited by Mac; 12/13/13 07:02 AM. Reason: noticed a typo after the morning's coffee kicked in...