BerniceC:  check This Out

this will tell you you're not alone with your problem :)

I think it's a DivX problem.  from the second site:
This
is a super simple fix. I just went through the same problem. all you
have to do is download the divx codec. go to divx.com and download the
divx codec. its free and will allow you to work. good luck guys

and

I downloaded DivX (free version) and installed it after experiencing the no video problem with .avi files and it solved it.

Let us know if that solves it  ;:)

BerniceC:

download this small and powerful player "VLC media player"

here:

http://www.videolan.org/

this one should work even with incomplete files and you shouldnt have to download all thos codec-packs, that may cause trouble on your cpu...

diogenysos:Thank you so much....downloaded the VLC player and everything is working just perfectly....I downloaded Happy feet as an .avi this morning and all is working well.
Groucho Thank you also for your information and it made me feel better knowing that it wasnt just me LOL.
I decided to download the player becuase it would have been easier to get rid off if it didn't work, but it is just great, so I am happy.

Thank you both so much

BerniceC:  Glad to have been of help ;)