Can't play my AVI-files anymore? please help..

Hi!
Something strange has happend to me.
I can’t play any AVI files. The problem begins when I’m opening a AVI in ZoomPlayer or any other player I have. I CAN see the first frame but the movie won’t start at all. The player freezes everytime.
If I opening an mpg-file it works perfect!
Please, Do you have any ideas where I should begin to look for an solution?

Find out what type of avi you have and for this download GSpot or Avicodec and open the file with the one you like both are analysers and give you some details.Be sure you have DivX, Xvid,and any codec pack like All in One or K-Lite or XP Codec.Zoom is a good player but won’t hurt to try a VLC or BSplayer. http://www.free-codecs.com/

I’m appending some links to Marcus Aurelius’s post in case you’re having trouble finding the diagnostic utilities
avicodec http://avicodec.duby.info
gspot http://www.headbands.com/gspot
videoinspector http://www.kcsoftwares.com/index.php?vtb

Hello, For some reason I can’t open avi files anymore .The only thing that will play them is nero showtime,every other player will call it an unrecognizable file.Can anyone please help!