WinFF is the Windows version of one of the most popular video converters on Linux. It enables you to covert video files into several different video formats including Xvid and WMV.
WinFF has a basic GUI with a multitude of options and functionalities that will help you select the videos you need, previsualize them and define the format of the conversion. In addition, there are other specialised options such as the ability to change the ratio of the conversion, the resolution or the quality of the audio track.
Although WinFF is a fairly stable converter, it does struggle with long names especially those with unusual characters. To avoid problem, I advise you simply all of the names of the files that you want to convert. Otherwise, you might find that the program simply rejects the files for no apparent reason.
This is a convenient and quick file converter that still needs a few bugs ironing out before it would be my number one choice.