[all variants] I want a new operating system and need help choosing one.

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http://ubuntuforums.org – Hi, I recently got a free computer from a church school and I got hooked up to the Internet. It's slow and still use window XP I'm looking to change operating systems and thinking about a Linux based OS. I want s,etching uncommon but not completely ubscure. I want something free. I'm sorry if this the wrong section to post in. Thanks, tahdas (Hardware)