U.S. stock index futures fell on Friday, as a stronger U.S. dollar weighed on commodities and natural resource stocks and weak results from computer maker Dell and homebuilder D.R. Horton underscored the rocky road to an economic recovery.

Dell Inc shares fell 6.4 percent to $14.86 in premarket trading, a day after the No. 3 personal computer maker reported third-quarter sales that missed estimates.

December crude futures sank 1.3 percent, extending a fall in the previous session as the U.S. dollar rose against a basket of currencies. The dollar index was up 0.7 percent.

Everyone is looking at the dollar right now, said Kim Caughey, senior equity research analyst at Fort Pitt Capital Group in Pittsburgh.

Low interest rates are supposed to make investors want to take risks, but that's not happening. People remain very nervous about the economy and especially about the consumer.

Investors are watching the technology sector, which is often viewed as one of the first to recovery from a recession.

Dell's sales increase concerns about the consumer, Caughey said. People are looking to see where consumers are spending, and they're not spending on Dell. That's weighing on the market.

D.R. Horton Inc reported a fourth-quarter loss that was wider than expected and said market conditions for homebuilders was still challenging.

S&P 500 futures fell 8.2 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures dropped 80 points, and Nasdaq 100 futures slid 10.25 points.

JM Smucker Co , the maker of jellies and preserves, reported higher-than-expected quarterly results and raised its full-year profit outlook.

General Electric Co and Vivendi SA are at least $1 billion apart in their valuation of Vivendi's stake in NBC Universal, the Financial Times reported.

Some big Goldman Sachs Inc shareholders have asked the company to cut the size of its bonus pool and pass along more of its profits to investors, the Wall Street Journal reported, citing sources.

U.S. stocks fell Thursday, as another batch of economic data pointed to the fragility of the recovery. Tech stocks were hard hit after a bearish brokerage view on the semiconductor sector.

(Editing by Jeffrey Benkoe)