Save the video in movie maker - help please

Hi,
I'm trying to cut out (mute) the sound of my video file (mp4) and so I opened it in Movie Maker program and now... from all the options that I have under the "save" I choose the first one "suggested for this project" (my translation from other language but I hope you know which option it is :) ). Unfortunately as my file was oryginally in 30 FPS, after saved it is 29 FPS. Also it has changed the speed on data transmission.

I'm only playing with the video for the first time, so zero experience so far and I couldn't find the answer here on the forum as also on the internet.

What am I doing wrong, please? :(

Try MPEG Streamclip: http://www.squared5.com/
Open file/Save Track/Save Video Track. The clip will be saved without audio.

Thanks scatt, but this program is not working on my computer and I don't know why :(
"... stopped working on this comp., trying to find resolution"...

There are 2 versions of the program for windows: 1.2 (2008) and 1.2b6 beta (2012), did you try both?

Yes, both not working...

You have to download and install QuickTime, using one of the following two installers (but NOT both!):
- Apple QuickTime 7 free player (http://www.apple.com/quicktime/download/win.html)
- KL QuickTime Alternative 1.81
(http://www.filehippo.com/download_quicktime_alternative/2615)