I need something to convert AVI files into WMV files so that I can watch them on an Xbox 360.

I've tried one program (Blaze Media Converter) and it muffed up the quality. I need something that can convert and keep the quality.

PS: It doesn't matter if it's free or not.

Anyone have any idea what I should use? I'm tired of the whole trial-and-error method of finding good software.
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