A word of caution from Google: Beware, Windows Google users. The company says perhaps more than 1 million computers have been infected with a strain of malware that affects Google search results. The malicious software infiltrates PCs using scams offering antivirus software via download.
Google discovered the malware only after noting irregular search patterns for a large number of its users during a routine maintenance check. The malware reportedly sends traffic destined for Google through proxy servers, where the malware’s creators manipulate search results before sending them back to users.
The company said it would warn users whose computers have been infected and help them update their antivirus software. Google began issuing a notification alongside search results stating "your computer appears to be infected," including a link directing the user to troubleshooting resources. The intended purpose of the malware is not yet known.