CAIRO — The Egyptian government pledged today to investigate official corruption and election fraud but thousands of protesters swore not to move from the heart of downtown Cairo until President Hosni Mubarak steps down.

After two weeks of instability that pushed the most populous Arab nation to the edge of anarchy, the crisis appears to be settling into at least temporary stasis.

A series of government concessions have left the protesters dissatisfied but the scene has remained calm, with Tahrir Square resembling a carnival more than the rock-strewn battlefield of recent days.

Mubarak’s regime appears confident in its ability for the moment to ride out what remains of an unprecedented storm of unrest, and maintain its grip on power, with Western backing, at least until September elections.

Egypt’s state-run news agency reported that Mubarak ordered the country’s parliament and its highest appellate court to reexamine lower-court rulings disqualifying hundreds of ruling party lawmakers for campaign and ballot irregularities, that were ignored by officials.

The ruling National Democratic Party won more than 83 percent of the 518 seats in the 2010 parliamentary elections. Implementing the rulings against NDP lawmakers could cause many to lose their seats and force the dissolution of the parliament and new elections if enough are disqualified.

Judicial officials promised to start the questioning on Tuesday of three former ministers and a senior ruling party official who were accused of corruption charges after they were dismissed by Mubarak last week. The cabinet reshuffle was intended to placate protesters by removing some of the most hated officials in the government.

A detained Google marketing manager who has helped organization anti-Mubarak demonstrations also was expected to be released.