Microsoft Security Essentials tool began falsely identifying Google Chrome as a piece of malware and removing it from people’s computers. If youre unable to launch Chrome or load new web pages, then you may be affected. We are releasing an update that will automatically repair Chrome for affected users over the course of the next 24 hours. In the meantime, if you want to fix the problem, please follow the instructions below. By default, your local browsing data will not be deleted. Visit www.google.com/chrome in another browser to download and install a fresh copy of Chrome.”]
Source: https://chrome.googleblog.com/2011/09/problems-with-microsoft-security.html