Hey motrader. To get a good sound, you will probably need a few things. The stock soundcard may not be up to snuff, and a good pre amp for your mic is very helpful. I don't know anything about the usb interface you are looking at, but do a search on it here, and see what it brings up. There are many good ones out there, so good luck. Takes some research. To use your stock soundcard in the mean time, you need to check the properties, and make sure it's set up right to use with a mic, if it's capable. Usually down in the bottom right corner of the screen, but sometimes you need to go into the control panel, and find it.
Good luck.
Ed
PS. Try a search in the computer recording/soundcard forum. May have more info on the particular stuff you are looking to get.