Microsoft Corp. said on Tuesday it has withdrawn a security update for its Windows XP software after discovering that it switched off Internet connections for some of the 600,000 users who downloaded and installed it.
The update, a small software addition that is used to fix and add features to existing software programs, was originally aimed at improving the security of Internet connections.
But after releasing the update on May 21, Microsoft discovered it was incompatible with other security firewall software used to protect home computers from attacks over the Internet.
That shut down Internet connections for some of the users who had other security software already installed on their computers. Microsoft said those users were not at risk of a security breach and did not experience widespread system crashes.
Removing the software update would restore the Internet connection, Microsoft said. A new update was being prepared, it said.