NEW YORK (AP) — U.S. stock futures are falling a day after the ninth-worst day ever for the Dow Jones industrial average and the second big daily drop this week.

About two hours ahead of the opening bell, Dow futures are down 79 points, or 0.7 percent, to 10,646. S&P 500 futures are down 10, or 0.9 percent, to 1,113.50. Nasdaq 100 futures are down 9, or 0.4 percent, to 2,076.

Stock futures don't always accurately predict how markets will open.

Cisco Systems Inc., considered a bellwether for the technology industry, rose in premarket trading after it reported profit above analysts' expectations.

The Dow on Wednesday plunged 519.83 points on worries about Europe's debt problems and the weak economy. It was the third straight day the Dow moved more than 400 points, either up or down. That hasn't happened since November 2008.