Unable to play 1080p videos

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http://askubuntu.com – i am dual booting windows and ubuntu (12.04), and i am unable to play any videos(1080p) on it , while on windows everything works fine. I have - -tried different media players (vlc, movie player etc) - tried to tweak performance settings after installing jupiter since i thought there might me some issues with power management - tweaking possible options in vlc (hardware ones) -removing and disabling any application which i found could be the cause of bug(when i searched the forums) the machine is a dell latitude d630 ,dual core 32 bit at 1.8 ghz and 2 gb ram with discreet graphics intel 9 (HowTos)