NO VIDEO!? DIV3 decompressor not found

I have a problem...

Whenever I play an AVI file on my laptop, I get sound but no video!

On Realplayer it says:

Unable to render video;
DIV3
decompressor
not found

What do I do!? I see the videos! >.<

Ok, I got it fixed! So, don’t worry now!

very luck!

Huh? Now, could a mod close this now?

i dont see why?
someone may have a similar problem and post here.