The presence of (13) Viruses have been detected on system fake alert indicates that you have opened an untrustworthy website, you have been redirected to a web page that serves various fake pop-ups, or you have a malicious software, most probably adware (an advertising-supported application) installed on the computer. Even though the majority of complaints regarding the presence of (13) Viruses have been detected on system fake alert comes from users living in Spain and the United States, you do not necessarily need to live there to see it because this fake alert is definitely not location-dependent. Do not pay any attention to it if you see it no matter that it contains a message claiming that a number of viruses have been detected on the computer because it just seeks to scare users into clicking the Download button and thus getting some kind of software. This software, even though it should be a legitimate antivirus for finding and erasing infections from the computer, will, most probably, be another malicious application. Unfortunately, we do not have any information about it at the time of writing because nothing happens after clicking the Download button. This suggests that there is some kind of problem associated with (13) Viruses have been detected on system fake alert. It might be fixed quickly, so it might be very true that some kind of program will be downloaded and installed when you click this button in the future. If this has already happened, go to delete the downloaded software because it is very likely that it is untrustworthy and will cause serious harm instead of finding and eliminating threats from the computer.
(13) Viruses have been detected on system fake alert is made to look very convincing: it contains a Google logo and mentions Microsoft. Also, a message on it claims that viruses have been detected on the system, and if they are not eliminated soon, they can cause harm and “incur total data loss.” It appears there to scare users into downloading “a certified Microsoft Antivirus” tool. Do not do that by any means because, as has already been mentioned, it might be a serious malicious application. Luckily, it is not that hard to recognize this (13) Viruses have been detected on system fake alert and thus ignore it completely. It has been found that these alerts might have URLs safensecure.com-allsites3.xyz or safensecure.com-allsites3.xyz/en/google/desktop_2 at the top. On top of that, the domain win123.com-allsites3.xyz might be visible too because it is known that it might display (13) Viruses have been detected on system fake alert pop-ups for users. If closing the fake alert does not help to get rid of it once and for all, it might be true that an untrustworthy application installed on the computer is the one responsible for displaying these fake messages.
Malicious applications distributing fake alerts, pop-ups, and other types of ads are categorized as adware. In the opinion of researchers at 411-spyware.com, this application might be responsible for the presence of (13) Viruses have been detected on system fake alert on the screen as well. It is especially true if it appears again on the screen after closing it. Undesirable applications usually find how to enter computers without permission. For example, an untrustworthy application could have sneaked onto the computer in a software bundle with other programs (e.g. freeware). Also, it could have been installed on the computer after clicking on an untrustworthy link/advertisement. Last but not least, its successful entrance might be the result of the presence of other threats on the computer. Unfortunately, it does not mean that other untrustworthy programs will never enter the computer again after the full removal of malware showing (13) Viruses have been detected on system fake alert. Therefore, in the opinion of specialists, it would be smart to go to install a security application for protecting the computer from dangers. Users must be cautious all the time too because malware is very sneaky.
If you suspect that an untrustworthy application keeps showing (13) Viruses have been detected on system fake alert on your screen, go to find and then delete it. Unfortunately, not all the programs can be deleted through Control Panel. Also, some of them might be extremely hard to erase, so you should scan your computer with an automatic malware remover, e.g. SpyHunter to clean your system. If you make a decision to get rid of malware manually, check Control Panel first and delete suspicious programs from there. Also, you should check %TEMP%, %USERPROFILE%\Downloads, and Desktop for any bad .exe files. Delete a malicious file immediately if you find it there.