Cannot activate mcafee antivirus

dear sir,
i bought a lenovo brand new laptop(the date 21st of jan) but it has mcafee antivirus but can not active
when i click on the active box , display a massage enter seirial key like
so, when i bought the lenovo they didnt gave any keys so, how i can install antyvirus?
please reply.
byeeeee.
Moderator edit: Added detail to subject.

The pre-installed Mcafee antivirus you got with the system is the limited period edition.
You can install you own anti virus program or can purchase a upgrade copy of the existing installed anti virus program from Mcafee
Best Regards,
Tanuj
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1. This is a comment on what you should—and should not—do to protect yourself from malicious software ("malware") that circulates on the Internet and gets onto a computer as an unintended consequence of the user's actions. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the computer, or who has been able to take control of it remotely. That threat is in a different category, and there's no easy way to defend against it. AV software is not intended to, and does not, afford any protection against such attacks.
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Gatekeeper doesn't depend on a database of known malware. It has, however, the same limitations as XProtect, and in addition the following:
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Apple has taken far too long to revoke the codesigning certificates of some known abusers, thereby diluting the value of Gatekeeper and the Developer ID program. Those lapses don't involve App Store products, however.
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☞ Software of any kind is distributed via BitTorrent, or Usenet, or on a website that also distributes pirated music or movies.
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Software that is plainly illegal or does something illegal
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London Terror Moovie.avi [124 spaces] Checked By Norton Antivirus.exe
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favour7 wrote:
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renefromnl wrote:
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