Software giant Microsoft Corp. is apologizing for altering a photo on its Web site to change the race of one of the people shown in the picture.A photo on the Seattle-based company’s U.S. Web site shows two men, one Asian and one black, and a white woman seated at a conference room table. But on the Web site of Microsoft’s Polish business unit, the black man’s head has been replaced with that of a white man. The color of his hand remains unchanged.