[ubuntu] Genral problem in videos and graphics issues

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http://ubuntuforums.org – When i open a video or play a game like neverball it never play good, the sound is great, but graphics is too slow. i am new in linux, and i don't know if there an drivers to install for the video card or something. i am using ubuntu 12.04, my computer has: 512 ram, 32bit sis graphic [sis 661/741/760 PCI/AGP], 2.6G intel processor. (Hardware)