Wall Street drifts as Nvidia loses some more momentum

U.S. stocks are drifting, as Nvidia continues to cool from its torrid run and worries rise about the strength of Europe's economy. The S&P 500 slipped 0.1% Friday, though it's still near its all-time high set on Tuesday. The Dow Jones Industrial Average was down 6 points, and the Nasdaq composite was flat. Nvidia again was dragging on the market again and heading for its first losing week in the last nine. European stocks fell after preliminary data reports suggested business activity among countries that use the euro currency is weaker than economists expected. Treasury yields slipped.