It's definitely not a Microsoft / XP process. End it, and see what happens. It's either from something you've installed (ie: either part of the necissary components, or a spyware component), or it's a virus.
I'm leaning towards virus, if it jacks your cpu usage to 100% (though Kazaa Lite used to do that, as did Gaim, due to bugs in the programming that have since been fixed)
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