When attempting to launch Symantec Installation Manager the message is displayed: "...has detected that there are pending system changes that require a reboot. Please reboot the system and rerun the installation."
This can also cause a reboot loop that never allows SIM to launch.
"...has detected that there are pending system changes that require a reboot. Please reboot the system and rerun the installation."
This is caused by pending reboot entries in the registry, whether valid or not.
The PendingFileRenameOperations registry value can be backed up and deleted. Symantec Installation Manager can then be launched, and the PendingFileRenameOperations value can then be replaced in order to facilitate launching without affecting the operating system or 3rd party applications negatively.
This method will leave several temporary installation files in the logged-in user's temp directory that would normally be deleted after a reboot.
ITMS 7.1, 7.5
For ITMS 7.5 SP1 and later, please refer to HOWTO101727 "Getting "Another installation is requiring a reboot to complete changes to the system." "