Microsoft would like to remind users about cyber criminals who attempt to take advantage of users who are aware of Java security alerts by creating fake virus alerts that force you to download malicious software, including malicious anti-virus software.
"In the case of the fake Java updates, cyber criminals are taking advantage of news about security vulnerabilities in Java and recommendations to update Java immediately. We agree that if you use Java on your device you should update it directly from the Oracle website," Microsoft warns users. There has been several reports about security alerts for Java in the recent months. Since Java is commonly used, cyber criminals often target users by claiming that their computer or device is at risk, forcing users to click a link to download malicious software. Microsoft recommends that Java users get their Java updates directly from Oracle or simply turn on automatic updates for Java, to avoid any problems.
http://www.winbeta.org/news/microsoft-warns-about-fake-java-updates-force-you-download-malicious-software