You need the appropriate codecs for your computer...

If you are using XP this pac is good...
Download XP Codec Pack 2.0.7.1 - XP Codec Pack is one of the most complete codec pack

If you are using Vista...
Vista Codec Package v4.4.5 (freeware)

You should also get the VLC media player it is one of the best and it's free...

VLC media player - Overview

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If you dont live for something...
You die for nothing...