I lost quality with windows moviemaker-HELP

[croarta]

I just bought a new camera – Toshiba Camileo BW10
Output format is .mp4
I film with TV OUTPUT: TV type: 16:9 and HDMI: 1080I and I use HD-SHQ
Video and picutre is amazing on computer as .mp4 format. Once i convert it to .avi quality is still okay ( i have to convert it cuz moviemaker doesn't allow .mp4) BUT when i put the same .avi clip in windows moviemaker and save the clip /using option – save as best quality (large)– it's so baaad + I downloaded those codes and still quality is changed.
So my question is – is there any free edit program for video ( I don't need any speacial effects or magic lol) wtih main transiton and option for adding music on movie clip that keep the same quality as it's filmed. Is there any program that it's okay with .mp4 format?
Thx a lot!

[Baldrick]

Try windows moviemaker live beta and see if you can export as wmv hd. Or try the free Pinnacle VideoSpin.

[croarta]

Ty
I will try n let you know!

[BadSeed78]

I used any video converter trial or video avatar, hope this will be helpfull

[namphong0612]

I sometimes use Windows Movie Maker to edit family videos too.
Those videos are always burned to DVD so that my relatives can watch, so when I edit with WMM, I export it directly to DVD with Windows DVD Maker. No significant quality loss.

Maybe not exactly what you're looking for, but just in case you need it in the future

[croarta]

Okay so I'm still using WMM and I conver .mp4 file with Any Video Converter to DVD Video NTSC Movie. Quality is ok but again problem with adding files to wmm.
Here: