"don't want someone doing something" feels somewhat informal to me. Also, it may emphasise repeated action (or, in fact, absence of repeated action) as opposed to a single instance -- although this distinction is not at all clear-cut (and also doesn't apply to stative verbs like "know").
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Kyung Soo ShinSorry, I should have typed Number 4, not Number 5.4. I don't want everybody knowing you've got a broomstick.What difference do you see between this one and the others?
GPY except that the first one seems a bit more informal.Now I think I can use it at lest in informal conversations.