Yeah, Xandros is a Linux distribution company.
Here's your portal to all things Linux:
http://www.linux.org/
It's freeware; just pop a blank CD into your CD-RW and burn a copy. (I know "free" sounds bad, but in my experience, "amateur" is actually a compliment in computing.)
Oh, and while we're here, it's pronounced lin-ux or lee-nux, not lie-nux.