Ok, we are awake in Sweden now so let’s take a look.
First off, it appears you are running an older version of CC Particle World which I don’t have on my machine but no worries. (With the newer version you would have used the Resistance control)
Good thing you included a snapshot of your settings.
You are using the Viscouse animation mode in which case the Extra control defines the resistance.
However, you have set this control to a negative value. This translates into negative resistance, meaning that the particles will accelerate and speed up. So what you are seeing is understandable.
Setting the Extra control to a positive value would slow down the particles gradually instead and that I assume would solve the problem.
-jens