Being PC Matic a technical software,it's users can face common issues like unable to install, PC Matic not scanning, cannot login to PC Matic account.
Facing above problems can be sometimes irritating for the user. But these issues have some simple solutions like :
1. Try uninstalling, and installing again PC Matic Antivirus.
2. Or, Logout from the account and login again (video can be found on the PC Matic official YouTube channel).
3. Or, PC Matic offers 24/7 support for it's users through helpline number, email support and official webpage.