Sounds like you've got a nasty trojan or two. Search the net for any clue such as any of the porn site URL's or any identifier of any kind. I've cleaned up several computers that were very badly infected, and I almost always found a reference. Failing that, you'll have to determine when the offending program loads. Good luck, it can be frustrating.
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"The gift of liberty is like that of a horse, handsome, strong, and high-spirited. In some it arouses a wish to ride; in many others, on the contrary, it increases the desire to walk."
-- Massimo d'Azeglio
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