Since it sounds like your computer setup is not optimum, you might want to get a portable recorder. The Tascam and Zoom models are very popular. If you get one, make sure that you get one that has an external mic input. If you can spend the money, get one with an XLR mic input. You might want to get a dynamic interview mic, such as the Sennheiser MD46 or, if you want to spend less, an Audio-Technica AT2005.

Learning to use a remove rig is not easy. It takes time and practice. The hardest part is making sure that your audio levels are neither too high nor too low.

Take a look at the video on this page to learn about the Tascam portable recorders: http://tascam.com/product/dr-05/