NEW YORK -- U.S. stocks on Friday were mixed after a two-day winning streak, as an unexpected drop in retail sales and high anxiety over the fate of investment bank Lehman Brothers Holdings Inc. weighed on investors' sentiment. The Dow Jones Industrial Average fell 11.72 points, or 0.1%, to end at 11,421.99, leaving the blue-chip index up 1.9% on the week. The S&P 500 climbed 2.65 points, or 2.7%, to 1,251.70, up 0.8% from last Friday's close. The Nasdaq Composite rose 3.05 points, or 0.1%, to end at 2,261.27, leaving the technology-laden index 0.2% ahead for the week.