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Group: Administrators
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All of the things you mention (codec, graphics driver, insufficient processing power) are potential causes. The specific symptom "slow & freezing" would point to either a remaining codec issue or insufficient performance *given* the way the AVIs are encoded. (AVI is a container format, i.e., the file extension alone says little about the actual video codec used). Trying to play back a HD-resolution video encoded with some modern codec (for which older graphics cards / drivers may not provide direct hardware support), can easily overwhelm an older system in terms of processing demands and lead to stuttering and/or apparent freezing.
I would try re-encoding the videos in question, possibly at a lower resolution and using a different codec, to see if this affects the play back performance on the system in question.
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