[ubuntu] NFG with questions

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http://ubuntuforums.org – I am the newbie here and have not a clue as to how UBUNTU works. Not only that, but I am digitally challenged. Every time that I get a new cell phone, I have to find a ten year old girl to explain it to me. I am sick and tired of having to revert my computer to the "out of the box" state in order to clear the Trojan that some S.O.B. has slipped onto my computer. I bought a used UNBUNTU computer in the hopes of eliminating this irritation. Now what I want to do is load Windows XP onto one partition of my new (to me) 80 GB hard drive and UNBUNTU onto a second partition. This is strictl (Hardware)