Right, every time I try to open or do something with my MPEG-4 file, my computer freezes and crashes. Why is this?

Right, every time I try to open or do something with my MPEG-4 file, my computer freezes and crashes. Why is this?
Does it take years to convert a film?
er dno.
Not really.
Perhaps about 1hr half.
But mine isn't working so I don't know...
Can anyone help?
EDIT: Got it to work - wahoo!
Last edited by Tristan; 31-12-2008 at 12:07 AM.
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