Came across a strange one today. Got the error message in the title. A bit of further digging revealed that the windows installer service would not start with Error 14007: The requested lookup key was not found in any active activation context.
The source of the problem stems from a P2V with VMware converter. For some reason it had disabled the DCOM Server Process Launcher service. Re-enable this and reboot the VM, the problem should be resolved.