I was having the same problem playing the video as Ratser had using ffdshow, but the codec pack that Saturos mentioned (Combined Community Codec Pack, in case you were wondering) did in fact solve the problem. I guess my point in bringing this up is perhaps CCCP should officially be added at least as an alternative (or maybe even an addition) to ffdshow in the "Installation" section of the FAQ, as another method in solving video playback problems. *shrug*