Maybe you haven't installed the same codec set on your 2 systems, or the ones installed on the Vista 64bit is buggy (while playing the video -> right-click -> Options -> Filters -> Advanced and then compare the 2 system's results).
I doubt it's related to graphic's drivers since BSplayer is able to render MKV files.
Have you tried to play that file on the first monitor? Is it still white or you can play it without problems?
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