Fix: Installers fail because of "pending reboot" (windows)

If an installer refuses to run because of a "pending reboot" to your system, it may be because of files listed in the "PendingFileRenameOperations" key in the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\PendingFileRenameOperations

Open that key in Regedit and check the entries. If they look harmless (especially if they are in some sort of Temp folder), remove them and try again.

More information here.