Sales of Windows to computer manufacturers to install on new PCs fell 19 percent in the quarter, reflecting a sharp dip from a year ago when Windows got a brief boost from consumers rushing to buy new machines after Microsoft stopped support for the 14-year-old XP operating system. Microsoft’s overall revenue rose 6 percent to $21.7 billion, above Wall Street’s average forecast of $21.1 billion, according to Thomson Reuters I/B/E/S. Taking out the effects of the strong U.S. dollar on currency rates, Microsoft said revenue would have risen 9 percent.