Mine is not starting either. It was working just fine yesterday.
Microsoft did do an update today. Maybe that is related?
Here is the error log:
[Tue Dec 10 11:27:46.499552 2013] [mpm_winnt:notice] [pid 6276:tid 384] AH00422: Parent: Received shutdown signal -- Shutting down the server.
[Tue Dec 10 11:28:09.743593 2013] [mpm_winnt:notice] [pid 1220:tid 276] AH00364: Child: All worker threads have exited.
[Tue Dec 10 11:28:17.886807 2013] [mpm_winnt:notice] [pid 6276:tid 384] AH00431: Parent: Forcing termination of child process 1220
[EDIT by Altrea: splitted from original thread]