You can find out what particular codec your video requires by using e.g. GSpot. You can find a link to GSpot in the second item of my
Help to Help post (click on the link hereunder).
I personally would start by downloading latest DivX codec (i.e. 5.1.1.)
here.
You need not install the player which is included in this "bundle"; you can simply deselect it.
If it appears from the information in GSpot that you require another codec, please have a look at
this post by
adicoto. Further an advice: stay away from codec-packs; or, if you use them, please use the possibility to
deselect items! Don't install everything what's in it!
More certainly isn't the same as
better! It only adds to increasing the possibility of conflicts and problems!