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the code you are trying to put in should be only for the new program
old codes will not work for new programs
next , with most security programs you have to uninstall the existing program then install the new one and then put in the code
call mcfee help desk for assistance
just don't pay the renewal fee
go into control panel, uninstall programs and uninstall the mcfee program
however be warned that when it is gone, you will get virus, malware and trojan horse into the computer and not even know it
best to have another virus protection system ready to install immediately
McAfee has controls that can lock you out of the internet. Are you trying to connect via wi-fi or ethernet cable? If it is wi-fi, try disabling McAfee, connect to your wi-fi then turn it back on. You'll need to make an exception for that connection. If wired, disable McAfee, make an exception for port 80, 8080, 23.