What codecs do you have installed? What player are you using?

I'd recommend switching to Media Player Classic (be sure to click Media Player Classic and not anything else ) and getting DivX 5.x codecs, as well as XviD codecs if you really need to.

Good luck - and please post what happened here when you installed the codecs/player so that we can refer people to this post and/or know what to ask for later on!

Sarf
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Use only as directed.