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try right clicking on whatever icons pop up when you are playing the video. Sometimes there is an option (atleast with mkv and some OGMs) to play the video inverted. Right click and change it back
Otherwise, try on the screen, right click and look at the options
If its still fubared.....I suggest unistalling Nemo or Klite codec (or whatever other POS codec packs you got) and just installing FFDshow alpha (latest build)
What type of video are you trying to play? What codec is required? (get a program called Gspot and it will tell you what codec is needed for the playback)