Why I can't access google products like google.com and youtube.com?
I had similiar problem with youtube videos not playing. I am using chrome browser mostly, so I will explain the method that fixed my problem.
Open the chrome settings
Open advanced settings.
On the Privacy section click content settings
Under the Cookies click the Manage exceptions and set www.youtube.com and youtube.com as blocked.
So the basically the problem is cookies. Above procedure solved my problem.