A flawed  update for McAfee VirusScan Enterprise took down an unknown number of corporate systems running Windows XP Service Pack 3 on Wednesday. According to reports, the faulty update caused affected computers to display an error message or a blue screen and to repeatedly reboot. "McAfee is aware that a number of corporate customers may have incurred a false positive error due to incorrect malware alerts," McAfee said in a statement. “The faulty update was quickly removed from all McAfee download servers, preventing any further impact on customers.” The security giant apologized for the blunder and issued a fix. It is unknown how many users were affected by the glitch. — AM