I cannot get the dropdown for the microphone settings.I did when I first installed it & then it records everything but the cassette.I cannot change it to usb microphone.

When you plug it into the usb port it should automatically install itself if it does not you might have to install it manually
if your computer came with a motherboard disc the drivers could be on it
click start control panel administrive tools ,computer management ,device manager look through all of your devices if you see a yellow question mark?or exclamation mark ! or red x
right click to reinstall drivers or
if you can see your usb but its not working
ports(com&lpt)right click update driver click start control panel sounds and audio devices select advanced there might be a tick in the mute box untick it or select audio from the microphone drop down list make sure you have the right one selected and in the volume box make sure the microphone box has a tick in it or select the voice tab and make sure that you have the right media selected also select volume make sure the box for microphone has a tick in it hope this helps