How to reduce a .avi movie size?

i hav got a movie which is on 797 mb , if it could be converted to 700mb somehow ?..its .avi

Get GSpot from doom9.net, or google it. Find what codec is used for the AVI. Could be DivX or Xvid. Get the appropriate codec, get VirtualDub, and re-encode the AVI.

Or you could Trim the credits at the end and the usless stuff at the beginning

how to trim >?

http://www.doom9.org/virtualdub_procedures.htm#Splitting