GREENS LINES PROBLEM.

Hi!

I am very new to AE (I started a day ago).
I have tried to search for the solution all over the internet and could not find it, therefore I decided to ask for help in the forums.
My problem is when I start a new project, I get many horizontal green lines (attached image). Is there any solution for this? Did I wrongly install the AE?

Thank you! (Sorry for my English, it is basic xd).