Windows Action Center (Security Center)
checks and monitors the status of your computer for Windows Firewall, Automatic Updates, Anti-Virus software, Internet Explorer Security Settings and User Account Control.
The Action Center (Security Center) gets its data from the Windows Management Instrumentation (WMI)
Repository and uses a two-tiered approach for detection status. One tier is manual, and the other tier is automatic through WMI. In manual detection mode, Windows Security Center searches for registry keys and files that are provided to Microsoft by independent software manufacturers. These registry keys and files let Windows Security Center detect the status of independent software.
It is not uncommon for Windows Security Center to sometimes stop recognizing your antivirus (or firewall) and you may need to stop/restart the service and rebuild the repository folder.
Since that is the first logical step to try, that is what the ESET folks are attempting to do with their instructions.