did anyone else have this issue? HP envy 1515. Try to install 3rd part software and keep getting message " a system reboot is required" Rebooted the computer, made sure all OS patches are applied. Shut the computer down. still same message. Find an registry entry in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SessionManager\PENDING FILE RENAME OPERATION. Made a backup of the registery. Cleared the value. software installed without any issues.
Of course I have reloaded the machine 5 times before I found this. Tried installing the softwre before the 8.1 update, after the update, before/ after other 3rd party software, etc.