Free Audio Converter is a Windows program that enables you to convert sound files from your PC between multiple audio formats. The utility comes with easy-to-configure output settings, works with many audio formats, supports batch conversion, and immediately generates the files you need.
All you need to do is to drag-and-drop the audio files you wish to convert, choose the preferred output quality, and click over the "Convert" button. The program will immediately export the files you require, without slowing down other running apps in the process.
Sadly, Free Audio Converter isn't exactly what its name implies. You need to upgrade the application to its Premium version in order to unlock all of its features and get rid of the annoying ads that are being displayed on the main window of the utility.
Another disadvantage is the fact that the program lacks the ability to extract soundtracks from movies, a feature that's available in many other apps of its kind.
To conclude, I'd say you should try a different utility for converting audio files on your Windows PC. You can find plenty of other audio converters that don't bring you the aforementioned flaws, are cheap or even free, and work perfectly.