I need to convert a movie of 700mb from mkv format to avi format. I have tried couple of softwares such as dream web etc. but, since they are trial versions, I was able to convert the movie only up to 3minutes. and there is a watermark on the video. please let me know if there is any registered s/w available in kat

I use (http://www.aimersoft.com/). You can find it here....(http://kat.ph/aimersoft-video-converter-ultimate-4-1-0-2-serial-hb-t4849879.html). Works great for me

Yeah Freemake is what I was going to suggest!
Also with the site you're on atm, I'm sure you could find one!

Format factory. works fast and with high quality.

As another user mentioned, FFmpeg is very good. Most converters actually use FFmpeg or MEncoder (or both), and all they really provide is a GUI. You can find pre-compiled versions here: http://ffmpeg.zeranoe.com/builds/ Then extract the FFmpeg executable to the folder of your choice. Open a new document in Notepad and copy and paste the following into it:

@echo off
title Convert to AVI
set /p FN=Drag input file here: 
echo.
set /p OFN=Name for output file: 
ffmpeg.exe -i %FN% -vcodec libxvid -sameq -acodec libmp3lame -b:a 128k -ac 2 "%OFN%.avi"
move "%OFN%.avi" "%userprofile%\Desktop"
pause

Save that file in the same directory as you did FFmpeg. Save as any name you like just make sure it ends in ".bat" for example "example.bat". Then run that file and follow the directions. The output will be on your desktop.

NOTE that "ffmpeg.exe -i %FN% -vcodec libxvid -sameq -acodec libmp3lame -b:a 128k -ac 2 "%OFN%.avi"" should all be on the same line.

DIVX and you can download right here at KAT

PP, the only thing I didn't like about the Audio Converter is it won't burn to a CD. (I was surprised)
But I noticed, that Freemake has a CD burning software in the works.

i tried using the freemake converter... it doesn't work 'coz when i convert file into avi or mpeg it wouldn't work on my dvd player.. it would only the audio but the video is not supported format..

x-media recode, good and free

Try Any Video Converter. There is a free version. You can google search it. It converts all video formats that I know off to any video format you want. I've been using it for ages for converting mkv to avi that can played on my standalone DVD player.

1Rebel... No, you can't just change the extension to .avi if you want to play it with standalone DVD player (at least that's what I think the original post wants). You have to really convert the file.