CCCP is all you need.
Vista codec pack. It's basically ffdshow with a load of other codecs included so you'll be able to play pretty much anything in Windows Media Player: http://shark007.net/vistacodecpackage.html
It also has x64 components that you can download if you ever need a codec pack for Vista 64.
this.
other codec packs are just rammed together, this has a ton of settings pre-tweaked for you
but with ffdshow you can upscale vidoesk-lite with media player classic running ffdshow for me
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