Use Start menu/Run or Windows +R and type
taskkill /FI “imagename ne explorer.exe”
This will shut down all programs started by your account. That means all programs started by you and some of the programs from the StartUp (but not applications started by the system).
It will try to shut down everything except explorer.exe. If you shut down “explorer.exe” Windows will try to shutdown.
Be careful of using the force option /F in this case, you might end up with a bluescreen of death.
I use this method before starting up games 🙂