Major indexes down for second straight week; Nasdaq Composite hardest hit U.S. stocks on Friday fell sharply to tally a second consecutive week of losses as a record decline in retail sales and a warning of falling mobile-phone sales hammered home the ongoing fallout of the ailing economy. The market again showed its erratic side in the final hour of trade, briefly turning higher as utilities and consumer staples gained, but ultimately being weighed down by technology. Finishing near session lows, the Dow Jones Industrial Average ($INDU:Dow Jones Industrial Average: 8,497.31-337.94-3.82% $INDU 8,497.31, -337.94, -3.8%) declined 337.94 points, or 3.8%,...