Microsoft Security Essentials, the free security solution from Microsoft removed Google Chrome showing it as a threat. Many users reported on the same as they found Google Chrome gone missing on their PC’s after allowing MSE to remove some password-stealing Trojan as it warned.
Microsoft has now released a patch to correct the issue and stated that the problem was due to a faulty definition file.
Their statement from Malware protection center,
On September 30th, 2011, an incorrect detection for PWS:Win32/Zbot was identified. On September 30th, 2011, Microsoft released an update that addresses the issue. Signature versions 1.113.672.0 and higher include this update.
PWS:Win32/Zbot is a password-stealing trojan that monitors for visits to certain Web sites. It allows limited backdoor access and control and may terminate certain security-related processes