System 1.0
But you don't want that
You could try a distro of linux. Nearly every one has some sort of live option, so you don't even have to install it until you know you like it. I recomend Ubuntu for a beginner. It's really easy for anyone to learn, mum had it figured out and the last computer she owned was in like, 2000. And they've changed a lot.
It even has an easy option of the live CD, so you could run it till you're blue in the face. The only thing is, it seems to have trouble with network adaptors like your ethernet and wireless unless it is installed, so you may not get internet why using it live.
Go with Hardy, 8.04 LTS. It's the latest, most likely to recognise your hardware right off the bat. And you can visit Ubuntu Forums for any info you'd need too.
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Every time you think you've made it idiot proof, someone comes along and invents a better idiot.
?the end of our exploring, will be to arrive where we started, and know the place for the first time. - T.S. Eliot