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…but Windows Vista/7 isn’t listed in your manual. Can it still be adjusted?

Yes, but you’ll have to follow a couple of different steps.  To locate your microphone, make sure the device is plugged in and locate the speaker icon on the near the clock on your taskbar.  Right-click the speaker and select “Recording Devices”.  Once the new window opens up, be sure to select the C03U as your recording device, and click the “Properties” button.  Within the new menu that opens up, please select the “Levels” tab, and you should see a slider that allows you to change the input volume of the microphone.  Start with the slider in the middle, test out the levels, and adjust accordingly.  Be sure to click “Okay” to save all the changes you’ve made once you’re finished.