how do i change avi to mpeg 2.?

convert it using TMPGEnc. do a search, u'll find tons of solutions

tmpg is the easiest i find , so ill echo that

hi, there are many video converter that can convert to another format, but i recommend you E.M. HD Video Converter. because i have been using it for a long time and it works really well for me.
it is a wonderful video converter that lets you not only convert your favorite videos to various HD (high definition) video formats like HD WMV Video, HD DivX Video, HD Xvid Video, HD H.264 Video, HD Quick Time Video, HD MPEG4 Video, HD FLV Video, HD TS Video, etc. but also create Blu-ray folder for PS3 and Blu-ray player. besides, E.M. HD Video Converter can easily burn all videos and AVCHD (mts, m2ts) to DVD, DivX DVD.
find:
http://www.google.com/search?hl=en&q=E.M.+HD+Video+Converter&btnG=Google+Search&aq=o&oq=
http://www.effectmatrix.com/hd-video-converter/index.htm

Yeah, TMPGEnc should work.
Here is another solution - iskysoft video converter. Works for all video formats.
http://www.hd-dvd-ripper.net/video-converter.html#139

I also have some video needed to convert to MPEG-2. I use YASA AVI to MPEG Conveter, it's pretty fast.