Then try to install an XviD decoder (you can either install XviD or DivX and enable support for generic MPEG4 types or install FFDShow which handles a lot of video types)
In the preferences try to change the video rendering options (under CTRL+P -> Video -> Video rendering).
Change the rendering mode (Internal renderer overlay (default) is the default one, try with different settings), the results are different on different machines and different videos, so you have to find yourself the best result you can achieve.
Can you also tell me what you have in the right-click -> Options -> Filters -> Advanced window (only available when a video is playing)?
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