NEW YORK (CNN/Money) - A profit warning from McDonald's and concerns about Iraq pushed U.S. stocks lower Friday, halting a four-week winning streak for the Nasdaq composite and the S&P 500 index, while the Dow industrials eked out a small weekly gain.

The Nasdaq composite (down 17.43 to 1359.28, Charts), Dow Jones industrial average (down 49.11 to 8537.13, Charts) and Standard & Poor's 500 index (down 7.91 to 894.74, Charts) all declined modestly on the day.

For the week, the Dow rose about 20 points, the Nasdaq was virtually unchanged, losing a little over one point, and the S&P 500 lost 6 points.

Stocks gained Monday, Tuesday and Wednesday after a Republican sweep of Congress and a surprisingly aggressive rate cut from the Federal Reserve. But Cisco's warning after the close Wednesday and McDonald's Friday proved too much for investors, dragging stocks lower.

"It's been a heck of a wrestling match all week," Peter Mancuso, a New York Stock Exchange specialist at Performance Specialist Group, told CNNfn's Street Sweep. "You've had a major turn. I think the market's better, I think it's gonna continue getting better, but that doesn't mean you're not going to see some pullbacks over the next three to six months."

The sharp stock rally in October had been based partly on hopes for a Federal Reserve interest rate cut, anticipation about the congressional elections and quarterly profit reports. However, with that period essentially done with as of Wednesday, there may not be a lot of new stimulus to get stocks moving for the next few weeks.

Stocks initially responded favorably Friday after the United Nations unanimously approved a resolution demanding that Iraq allow U.N. weapons inspectors to search for weapons of mass destruction.

"When they passed the U.N. resolution, it gave us a spike [in the] very short term, but then war fears crept in and we started moving lower," said Donald Selkin, director of research at Joseph Stevens. "But it's also more of an earnings story today, with companies missing their earnings or warning. You've got McDonald's, nVidia and Tenet Healthcare, which is spooking all the health care and hospital stocks."

Fast-food retailer McDonald's (MCD: down $1.52 to $17.79, Research, Estimates), a Dow component, warned early Friday that its 2002 earnings per share will miss estimates amid weaker sales in the U.S. and increased competition. The company also said it will close about 175 restaurants in 10 countries outside the U.S. and cut 400 to 600 jobs.

Shares of Tenet Healthcare (THC: down $13.05 to $14.90, Research, Estimates) plunged after the hospital operator announced the resignation of its chief operating officer and chief financial officer. The company is under investigation by the federal government for allegedly overbilling Medicare.

Additionally, shares of Dow component Walt Disney (DIS: down $0.58 to $17.68, Research, Estimates) fell after the media and entertainment company reported a higher fourth-quarter profit late Thursday but expressed concerns about operations at its ABC television network and its theme parks. After the news, Merrill Lynch downgraded the stock to "neutral" from "buy" on valuation concerns, while Lehman Brothers trimmed its fiscal 2003 earnings estimates.

On the Nasdaq, selling in software, telecom and select chips pulled the index lower.

Oracle (ORCL: down $0.65 to $9.55, Research, Estimates), Nextel Communications (NXTL: down $1.00 to $12.00, Research, Estimates) and Vitesse Semiconductor (VTSS: down $0.21 to $1.68, Research, Estimates) were among the bigger decliners.

Shares of graphics chipmaker nVidia (NVDA: down $3.19 to $11.36, Research, Estimates) fell after the company reported a fiscal third-quarter loss compared with a year-earlier profit and analysts' estimates for a profit, due to charges for a stock option exchange.

Treasury prices rallied, pushing the 10-year note yield down to 3.84 percent. Treasury prices and yields move in opposite directions. The euro rose to $1.01 against the dollar. The U.S. currency also slipped against the yen.

Light crude oil futures rose 40 cents to $25.78 a barrel. Gold settled at $321.70 after rising above $323 an ounce.

Market breadth was negative. On the New York Stock Exchange, losers beat winners more than 9 to 7 as 1.43 billion shares changed hands. On the Nasdaq, decliners beat advancers 9 to 7 as 1.58 billion shares traded.