Wait 30 seconds then place your left index finger on the left shift button.
Restart the Mac with your right hand.
When you hear the chime, let go of the shift key.
Allow Mac to boot up completely.
You will have to sign in again.
As the Mac boots up, your presets will be gone.
Do not worry.
Wait till it boots up again.
When it has booted up, delete trash.
Voila it should be gone.
Shut the Mac off.
Wait 30 seconds to restart the Mac
Your presets should be present.
Put something in the trash that you are not in need of.
It should be gone.