Hi there! I've downloaded the Apprentice version of Houdini software and i've followed the first twelve basic tutorials on this site made by Ari Danesh. My english is not that good, so, i probably misunderstood how to properly render a scene. In fact when try to render i always obtain images full of white & grey points covering all over my image, like in the picture.
Can you please tell me where i made a mistake?

Thank you very much for your time, and have a nice day

What are you trying to render? Do you have enough Pixel Samples? You can find Under Properties>Sampling>Pixel Samples.
Post your .hip file for better assistance.

>>>Pixel Samples<<< I've increased that value, and the dots have disappeared! Thank you very much PradeepBarua, and forgive me for this noobish question!