(Bloomberg) -- The cyber-attack that spread rapidly around the globe was stifled when a security researcher disabled a key mechanism used by the worm to spread, but experts said the hackers were likely to return as many computers remain at risk.

Hackers can still gain easy access to personal computers that lack a security update issued in March by Microsoft Corp. to fix the vulnerability in its Windows operating system. The company, which had labeled the March patch as “critical,” said it was now providing a security update for all Windows customers.

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