1 run the virtual technician it might find something corrupt though it now is more aimed at the newer versions than 12.8 .
2. Uninstall and reinstall the product as per
3 contact support after you have tried 1, 2 and 4
4. Do a few tests with some of the free scanners included in the link below. with getsusp add your email address to its preferences and with Malwarebytes use the free version not the free trial.