Ubuntu
Full user review
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"Works like a dream. I don't use Windows anymore."
Pros
It does what you want it too, when you want it too.
Cons
It takes a wile to set up for MP3's, CD's, and DVD movies.
Summary
It doesn't download stuff, update stuff, or restart without your involvement and permission. It also will run safely on the web without an anti-virus and firewall. It comes with all the software most people need already included or easily down-loadable for free.