Question 2: "I want to convert these mp4 files into something that wont lag when i play it and something that i can play in Windows Movie Maker. "

Question 3: "Which codec do i need to install to put mp4 files into movie maker on windows 7? and how do i find it, could you recommend some sites to get it?"-from Yahoo Answer!
You also have a bundles of .mp4 files, some downloaded from web, others from camcorder shootings like Flip video, Gopro video, etc. MP4 file can be easily playable on Windows Media Player 11. However, Windows Movie Maker says "NO". In fact, there are two ways out: one is to download some MP4 codec (mp4cam2avi) or Windows Movie Maker codec, the other way is directly convert MP4 to Windows Movie Maker compatible file formats like AVI or WMV.

If you hope to fix the issue ASAP, it is recommended that choose the second solution, for you have no need any knowledge about video codec. Have to mention, it is very easy to handle. Several three or four steps are enough for the whole job.

Windows Movie Maker Converter provides an effective solution for converting all kinds of MP4 file (in different codecs) to AVI/WMV/MPEG for WMM. If you just try to use the WMM to cut the clip into short ones, the Window Movie Maker Converter can do that for you. What you need is to go to "Clip" section before do the conversion. More practical editing options are equipped: video cropping, make advanced video or audio settings.

Note: Window Movie Maker compatible file types:
Audio: .mp3Video files: .asf, .avi, .wmv
Movie files: MPEG1, .mpeg, .mpg, .m1v, .mp2
Audio files: .wav, .snd, .au, .aif, .aifc, .aiff
Windows Media files: .asf, .wm, .wma, .wmv
Still images: .bmp, .jpg, .jpeg, .jpe, .jfif, .gif

Here show you how to convert MP4 to Window Movie Maker in details:

1. Free download the Windows Movie Maker Converter.

2. Add MP4 file(s) into the program
Open the software, click "Add File" button to load the .mp4 into application.

3. Choose "WMV" as output file format
Alternatively, you can choose AVI as output file format under the menu of "Profile" and specify the destination folder for the converted files.

4. Begin to the conversion from MP4 to WMM
Hit "START" button to start converting MP4 to Movie Maker.

When the conversion is completed, you can open Windows Movie Maker, click "Movie tasks" and select "Import video" to import the generated clips.