Trojans: like the ancient wooden horse full of attackers it takes its name from, this malware pretends to be harmless legitimate software, or comes embedded in it, in order to trick the user and open up the gates for other malware to infect a PC. Here are some of the other, most common kinds: Computer viruses are just one kind of malware (mal-icious soft- ware). Not every piece of software that attacks your PC is a virus. Viruses are unique from other forms of malware in that they are self-replicating - capable of copying themselves across files or other computers without a user's consent.īasically, they are really contagious. Looking for an essay-friendly definition? Here it goes:Ī computer virus is a program or piece of code designed to damage your computer by corrupting system files, wasting resources, destroying data or otherwise being a nuisance. On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window.A computer virus definition, Wikipedia-style Release the key when you see the login window, then log in to your Mac.Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.Select your startup disk, then press and hold the Shift key while clicking “Continue in Safe Mode.”.Turn on your Mac and continue to press and hold the power button until you see the startup options window.Triggering the Safe Mode option depends on your Mac: the Intel or Apple Silicon chips will have another process to follow. Reboot your computer, or enter this command instead: sudo killall -1 installdīooting your Mac in Safe Mode is your next best option.Paste the following commands and press Enter: sudo rm /private/var/db/mds/system/.Here are the steps to follow to manually remove the installer lock: But other reasons exist as well, including an application which starts during the bootup and tries to install an app on your device. The reason could be that the previous installation failed because your Mac ran out of battery and had to shut down in the middle of the installation process. There is a big likelihood that the previous installation has failed, but the lock was not removed.
Remove the installation lock via Terminal on your Mac has high chances of succes as well. In the ‘Force Quit Application’ window, you can select the application which is stuck. You will be prompted with the message: ‘Do you want to force “Installer” to quit? You will lose any unsaved changes.” and here you must click ‘Force Quit’. Select the installer application and choose to ‘Force Quit’ it.
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