Well, what's your computer's manufacturer? I'd like to know.
Did you install a XP Pro that you bought (separately from computer)? You should restore from manufacturer's recovery disks OR (in case of Compa0q/HP, restore from within computer before booting to windows)
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Also, once XP is back online like you wanted, I suggest you get AVG or AVASt (free antivirus, updates at least once a day) amd also disable windows firewall and install commodo firewall. Stop those spyware!