AROUND 3000 Google Chrome users had their browser programs deleted because of a bug in Microsoft’s anti-malware product Security Essentials.
The problem was a bug in the program’s virus definition update, Microsoft said on its website.
The company had identified and corrected the issue within minutes on Friday, but by then some users found their Chrome browsers had been uninstalled.
Users of Microsoft Security Essentials are being urged to install the latest anti-virus update to avoid the problem.
“On September 30th, 2011, an incorrect detection for PWS: Win32/Zbot was identified and, as a result, Google Chrome was inadvertently blocked and in some cases removed from customers PCs,” Microsoft said.
“We have already fixed the issue — we released an updated signature (1.113.672.0) at 9:57am PDT — but approximately 3000 customers were impacted.”
A Microsoft spokesman says affected users should manually update Microsoft Security Essentials (MSE) with the latest signatures.
“To do this, simply launch MSE, go to the update tab and click the Update button, and then reinstall Google Chrome,” he said. “We apologise for the inconvenience this may have caused.”
The Microsoft post said Win32/Zbot was a password-stealing trojan that monitored for visits to certain websites.
“It allows limited backdoor access and control and may terminate certain security-related processes,” it said.
Google has also issued an update to fix the Chrome browser.
“We are releasing an update that will automatically repair Chrome for affected users over the course of the next 24 hours,” Google said in its Chrome blog.
“In the meantime, if you want to fix the problem with Microsoft Security Essentials and restore Chrome manually, please follow the instructions below.
“If Chrome is working correctly for you, then there’s no need to take any action.”