Techs could lead downturn

NEW YORK (CNNMoney.com) -- Wall Street's tumultous week ends Friday with stocks headed lower - with the tech sector especially vulnerable after Dell's earnings report and outlook.

At 6:30 a.m. ET, Nasdaq futures were down. S&P futures turned lower after being up in the early morning hours.

Asia stocks ended mixed, with Tokyo's Nikkei down for a fourth straight session while Chinese stocks, the catalyst for this week's worldwide selloff, gained ground. Europe was flat to lower

Oil was higher. U.S. light crude rose 29 cents to $62.29 a barrel in electronic trading.

Treasury prices were lower, raising the 10-year note yield to 4.56 percent from 4.55 percent late Thursday.

Dell (Charts) reported a 33 percent decline in fourth-quarter profit, and warned that growth and profit margins will be under pressure for the next few quarters. Shares fell 2 percent in after-hours trading Thursday.

Among other stocks in the news Friday: Wal-Mart (Charts) and Google (Charts).

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