[ubuntu] Looking for Graphic driver help

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http://ubuntuforums.org – Hello, im new to this forum and pretty green as far as Ubuntu goes. I loaded a 12.1 unto an old deskptop i dusted off in the basement for a little fun when i have time. Mainly for multi media. Everything installed fine. However, my system was running Really slow. I thought it was the memory. after checking requirements, i determined I was fine. then i realized that my Graphics driver showed it was "unknown". That led me to multiple web searches with no results. if i could get some guidance on how I can find out my specific graphics model, where to find a driver for it and ho (Hardware)