Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
How to Keep Your Mac Secured Against Unwanted Threats
Internet users know how dangerous the modern World Wide Web can be for the average home computer. A deluge of viruses, malware, and spyware seems to lurk around every corner, threatening to infect your computer with unwanted files that could wreak havoc on your data, and potentially cause problems as great as identity theft. While Macs are fortunately much less vulnerable to data mining and viral issues that their PC counterparts, even Apple machines are not perfectly safe from outside intrusion.
Mac developers recommend taking extra security measures to ensure that your system stays safe from outside intrusion. There happen to be many different antivirus solutions that are great products for keeping your machine safe. Some of these software programs provide not only antivirus protection, but also is automated tools that make it easy to manage routine tasks without thinking twice. You can easily find a similar program by reviewing some reviews from a wide variety of third party reviewers, including Enoda.co.uk, MacUpdate.com, and BrotherSoft.com.
One of the truly remarkable features of the these programs is that they will keep your machine protected from both Mac and Windows threats, wrapping your computer in a virtual shield of protection that will not budge for threats. Just like antivirus programs that run on a Windows machine, you will want to continually monitor the contents of your machine. This will guarantee that your system is running without an issues, and keep your computer safe from infection.
To run a scan on your machine, you'll first need to launch the application. Many such programs offers an intuitive design that makes it blend easily with your system, thanks to navigation bars that are rather reminiscent of those found in Finder. When scanning your computer, you can choose to specify specific areas of your machine that you would like to scan, or simply have the software check the entire computer for any current threats. If threats are found, you will be given the option to quarantine the offending file or delete it from your machine.
Because many programs offer automated features, you'll likely want to make system scans occur without any input on your end. This will ensure that no threats are able to go undetected, in the event that you would forget to scan the system. You can choose to have the scan repeat itself as frequently as you'd like.
Keeping your machine operating free from threats can be a real challenge, but armed with MacKeeper, your data and precious computer is safe. Staying proactive is the best way to make certain that your computer stays protected. Fortunately, installing a quality antivirus software makes it easy to do just that!