Treasury Secretary Henry Paulson called the financial crisis now plaguing the world economy a "once or twice" in a 100 years event, even as he warned Thursday against imposing too-strict regulations to prevent a repeat calamity.

AP Henry Paulson

Paulson's remarks follow pledges by world leaders attending last week's emergency economic summit to begin an overhaul of the world's financial regulatory system.

With the next summit slated for the spring, the work on fleshing out details for the Herculean task will fall to the incoming administration of President-elect Barack Obama and his new Treasury secretary.

Paulson, whose boss President George W. Bush leaves office on Jan. 20, acknowledged that the financial crisis was caused by many factors including "government inaction and mistaken actions, outdated U.S. and global financial regulatory systems, and by the excessive risk-taking of financial institutions."

Still, he cautioned against the U.S. and other countries developing a too-onerous regulatory response. (See Paulson's speech, left.)

"If we do not correctly diagnose the causes, and instead act in haste to implement more rather than better regulations, we can do long-term harm," Paulson said in a speech in Simi Valley, Calif.

Earlier this week, lawmakers blasted Paulson for his handling of a $700 billion financial bailout package to help ease the crisis and restore stability and confidence to unhinged markets.

Paulson on Thursday again defended his management, including his decision last week to officially abandon the original rescue strategy: buying rotten mortgages and other bad debts from banks to free up their balance sheets and get them to lend more freely.

"By proactively addressing the problems we saw coming and being pragmatic enough to change strategy in the face of changed facts and despite the inevitable criticism—we prevented a far worse financial crisis," Paulson insisted.

Focusing the bailout program on infusing billions into banks—and possibly other types of companies—to pump up their capital and bolster lending to customers was deemed a faster and more effective approach to stabilizing the financial system than the original centerpiece of the plan, he said.

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