Exchange CU Installer: A reboot from a previous installation is pending.

Issue

When applying Exchange 2013 CU’s, I’m often faced with the following error during pre-req checks.

Error:
A reboot from a previous installation is pending. Please restart the system and then rerun Setup.
For more information, visit: http://technet.microsoft.com/library(EXCHG.150)/ms.exch.setupreadiness.RebootPending.aspx

PendingReboot01

Resolution

Rebooting the server doesn’t help!

Open Registry Editor, and locate the following key:

HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\PendingFileRenameOperations

PendingReboot02

Check the content, typically it’s print spooler related rubbish.

PendingReboot03

Clear the content.  Click OK.

PendingReboot04

Back to the Exchange 2013 CU installer, click retry & you should be good to continue.

PendingReboot05

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