[ubuntu] netbook running slow and shutting down

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http://ubuntuforums.org – I just installed ubuntu on my Acer Aspire One netbook. (model # nav50) because windows 7 starter was messed up. Ever since i installed ubuntu, everything seems to lag. And while trying to figure out what was wrong, i recieved an error message but i don't know why... This is my first time trying Linux. I'm hoping to expand my knowledge because I've always heard Linux is one of the best OS around. Any help with this current problem and advice on how to utilize properly would be great! thanks! (Hardware)