As I understand the McAfee Which is installed on your Computer shows it is expired even though you have valid subscription.
Try the following trouble shooting steps to fix the issue.
1.Check your system Date & Time whether it's correct according to your time zone if it's not change the Date & Time than right click on the McAfee and click on verify subscription.
2. You can also run subscrption repair tool to fix the problem use the following link to do that :
3. Once you run subscrption repair tool please update the McAfee.