When Windows installed updates or made related changes to the operating system, changes may become effective only after a reboot. While a reboot is pending, the operating system may not yet be fully protected, and you may not be able to install additional software.
Whether a reboot is pending can be determined by testing for a special registry key:
$rebootRequired = Test-Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootPending" "Pending reboot: $rebootRequired"
If $rebootRequired is $true, a reboot is pending.
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