Windows 7: Change aspect ratio on video file

Does anyone know any good software for manually changing the aspect ratio/resizing of video files

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yes i tried that one but when i change the aspect ratio it doesnt render it too 16.9
any other suggestions??

Try the Windows Live Movie Maker. It is in the View tab and the choices are 4:3 and 16:9.

no ive tried that aswell
with three different versions of movie maker and it doesnt work

If the files are MKV and you have DivX installed; that causes bad aspect ratio's with PC playback even though they may be fine on the xbox360.

its just an avi file
i wanted to upload the film to youtube it looks much better @ 16.9 even though its slightly stretched
i might just play the film with media player classic and resize it to 16.9 and then just leave it recording using fraps.
and then just butcher it up in chunks for youtube

That's strange. It works for me.

Try avidemux:

Avidemux (en)