TECH Looking for an MP4 to .avi or WMV converter

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I've been recording some videos on my cell phone which creates them in .MP4 format, which neither Windows Movie Maker or Premiere Pro support despite having the K-Lite codec pack installed.

So I'm wondering if anyone can recommend a simple to use free or open source program which would convert them into either WMV or .avi.

Any recommendations you could make are much appreciated.

Many thanks