[ubuntu] Help with Graphics card

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http://ubuntuforums.org – I just installed 9.10 and was looking at some of the RSS Feeds. Many people say that they update their video card drivers right after install. How is this done? I have an Acer Aspire 9410 Laptop with the Mobile Intel 945GM Express chipset. I tried to search but couldn't find anything. Right now I'm stuck with having mirrored display between my laptop and the monitor. Every time I take mirrored off both screens go black and I have to wait until it reverts back to mirrored. Thanks in advance for any help. video confused!!! (Hardware)