We have created a sample version of an experiment that contains videos (WMV files). When running the experiment in Windows XP, the videos always appear correctly on screen. However, when running the experiment in Windows 7, although the videos usually appear correctly, in some cases they are too small, are cut in half with only the top part showing, etc. These errors appear to be random, but do persist over time. Is there anything that can be done to remedy this situation?