Cristina Fernandez was sworn in Monday as Argentina's first elected female president, completing a rare husband-wife transfer of power as she promised to keep the nation's economic recovery moving forward.

Fernandez, whose husband is credited with leading Argentina out of its 2001-2002 economic meltdown, vowed to deepen the center-left economic programs of outgoing President Nestor Kirchner, create jobs and reduce high poverty levels.

During her hour-long inaugural speech, Fernandez's voice rose in anger as she demanded that dozens of slow-moving court investigations of human rights abuses of the 1976-83 dictatorship be speeded up.

"I expect that in the four years of my term, trials that have been delayed more than 30 years will be concluded. We must try and punish those who were responsible for the greatest genocide" in modern Argentine history, Fernandez, 54, told a packed Congress after taking up the blue-and-white sash from Kirchner, who gingerly adjusted it on her shoulders.

Nearly 13,000 people are officially listed as missing or dead under a "dirty war" crackdown on dissent by past military governments. Activists estimate nearly double that number died.

Fernandez, who has been compared to U.S. Democratic hopeful Hillary Clinton as a powerful ex-first lady seeking the presidency, embarks on a four-year term whose main challenge will be to prolong an economic recovery that has seen annual growth rates above 8 percent in recent years.

"I believe we have regained our balance," Fernandez said, recalling how her husband took office in May 2003 amid a debt default and a searing devaluation that was Argentina's worst economic crisis in history. "In four and a half years this president — together with all Argentines — was able to change the scenario we were facing."

She vowed to strengthen Argentina's oft-criticized justice system, overhaul a poorly funded system of public schools and tackle rampant crime and a looming energy crisis.

Several South American presidents looked on and thousands of supporters outside Congress waved blue-and-white Argentine flags.

Fernandez, a three-term senator who won office handily on their left-leaning Victory Front coalition ticket, captured 45 percent of the ballot against a divided opposition Oct. 28. She joins Michelle Bachelet in Chile as the second sitting female president in South America.

Approval ratings for Kirchner topping 60 percent have been largely credited with Fernandez's victory, although she was praised for an astute, unorthodox campaign. Refusing to debate any of her rivals and granting few interviews, Fernandez preferred to be photographed overseas meeting world leaders — projecting a flair for international diplomacy while masking a lack of executive branch experience.

Fernandez seems unlikely to alter Kirchner's alliance with Latin American leftists such as Venezuela's Hugo Chavez, but she could forge better ties with the next U.S. president

At home, the new president will try to correct some lingering headaches from the Kirchner term: inflation that private economists estimate in the double digits, corruption scandals and the long-sputtering energy crisis. Unemployment is mired at near 10 percent and a quarter of the country's 39 million people are poor.

Kirchner re-negotiated payment on the debt, and the recovery blunted memories of hungry people scavenging for food in trash bins and depositors hammering on bank doors after losing savings overnight.

Sustaining recovery will be a priority for Fernandez, but unions demanding salary hikes will challenge the government and sporadic energy shortages could hamper growth, analysts said.

Riordan Roett, director of Western Hemisphere studies at SAIS-Johns Hopkins University, said the nation has benefited from a benign global economy and booming export tax revenues amid soaring grain prices.

"If there is a slowdown anywhere, she will pay the price," he warned.

Argentina's first female president was Isabel Peron, the second wife of former strongman Juan Peron. She assumed power when he died in 1974, and was ousted by a coup after 20 months in office.