When attempting to install the Exchange 2010 Management Tools I was receiving an error “A reboot from a previous installation is pending.”. Turns out this was due to a reg key that was referencing printers that were being installed via GPO/Pushprinters.

To resolve this I deleted the following reg key:

HKLM\SYSTEM\CurrentControlSet\Control\SessionManager\PendingFileRenameOperations

As always, when making registry changes, be sure you backup the key before you delete it.