hey, quick question

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i recently upgraded to win xp and gave my old win me upgrade edition to a freind. he upgraded with no prob, and so far no glitches or anything except the fact that mouse properties dialog box pops up every time he starts windows. there is no accual problem with the mouse or anything else. it is merely an annoyance and i was wondering why it would do this and how i could make it stop?
thank you!!!