I have installed the antivirus program and have the activation key, but I am asked to enter my credit card details to activate it. What should I do?

Some antiviruses, even if already activated, ask for credit card registration to enable automatic renewal.

In some cases, this step is not mandatory and can be skipped.
In cases where the step is mandatory, after entering your card details and completing the activation, you can access your account to deactivate automatic renewal and remove your card details.