Right click on the speaker icon in the taskbar.
L click Recording Devices (for some reason a usb AI shows in W7 as a microphone!)
L click "usb Audio CODEC (you might have to re start the computer)
L click Properties.
L click Levels. This will be at 100, drag it back to 10.
"OK" Rock and roll. Note also that the meters on the ZED will now roughly agree with DAW levels.