text:  The week on Wall Street dragged to a close. Stocks drifted lower on Wall Street, erasing the market's gains for the week. The S&P 500 slipped 0.4% Friday, but remains close to the record high it set last week. The Nasdaq Composite fell 0.7%. The Dow slipped 45 points, about one-tenth of a percent. Nike dropped 20% after the shoe and athletic wear company missed Wall Street's revenue targets and cut its full-year sales guidance. Executives said they expected sales to