Microsoft Corp.'s 2001 antitrust settlement with the Bush administration hasn't reduced the dominance of the company's Windows personal computer operating system, a Justice Department lawyer said yesterday. There has been "no demonstrable change in the operating system marketplace," government lawyer Renata Hesse said in Washington in response to a question from the federal judge overseeing the accord. "Microsoft continues to have a large share in that market." The 2001 agreement resolved a suit that at one point threatened the world's largest software maker with a breakup ................................................... Kollar-Kotelly, who approved the settlement in 2002, said she wasn't concerned about Microsoft's...