Hello,
Simply Click on "OK" and Run a Full Scan.
This may happen when situations that may require an immediate restart include malware remediation, schedule urgency, and proactive threat protection against an imminent threat. As well as essential content updates.
Secondly on a kind note, please migrate the SEP SBE 12.0 to the Latest version of SEP SBE 12.1 RU1 and above.
How to upgrade your SEP11 license to SEP12 online
Hope that helps!!