Darth Vista requires a different CODECs pack than XP.
Do a Google search for
vista codecs and you`ll be fine.
There are many alternative CODECs packs available and suitable for Vista...
Some are better than others.
Try the basic pack from Microshaft first, and then perhaps play around with the others that are available.
btw.. NEVER pay for any CODEC pack !
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Oooops.... We were both posting at the same time !
Download and install VLC media player... It definitely is OK with the dreaded ugly fat Vista....
DivX player is not particularly good and very limited in comparison to VLC.... VLC is 100% free...