You may have recently heard about a windows security vulnerability in the news called PrintNightmare (CVE-2021-1675). Although your firewall should be configured to prevent such an attack, Microsoft recommends the following PowerShell commands be run on your Windows server to disable the print spooler service (you can also disable this service manually in the UI).
Stop-Service -Name Spooler -Force
Set-Service -Name Spooler -StartupType Disabled
If you are wondering whether shutting this service down will effect Rock's check-in "server" based printing, you can rest assured that the standard Rock check-in server based printing does not use the Windows print spooler, so there is no reason to run the print spooler on your Rock Windows server.