The reboot "should" clear the pending file rename action. Windows deletes the old file, moves the new file from the temporary location to the target location (this removes the registry entry), WFP detects the file change and a rollback to the original file is triggert. So after the reboot, the registry entry "should" be gone. It is not advised to manipulate the pending rename registry on your own. It's very well possible that other programs or a windows update added items.