Hello Guddu020305,
I guess you have brought a retail card for McAfee Antivirus. You should activate the retail card towards the end of your current LiveSafe subscription. During the activation use the same email that you have used to register your existing subscription. You can then contact support to have your subscription date updated. They would run a subscription repair tool to fix discrepancy in expiry date.
Cheers
Sanjay
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