Warning! Critical update is a fake alert which you may receive in your browser while visiting some sites. This is the method how hackers online prompt users into downloading rogue security software. The program hijacks your browser and imitates the attempt to update some software installed on your computer. You might encounter an alert about a supposed update available for browsers like Internet Explorer, Google Chrome or Mozilla Firefox. Or, quite possible, this fake update will mention the necessity to update your entire operating system. The alert tells that your system is in danger and that you need to install…