If you are facing errors like 'The key is already in use' then it is advised to delete the key from your application. Afterwards, activate the product once again.
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You must have noticed that sometimes files of previous installed antivirus software remain on the computer system. It might hamper the installation of Kaspersky antivirus. For removing the antivirus software properly you might need expert's guidance.
Lately, ransomware joined the cyber-attacks list and thus, it became the popular and dangerous online threat. It is very dangerous from that of other risks and malicious activities.