Posting this multiple times will just annoy people.
You are still not giving enough information.
Have you tried to run one of the built-in templates - a platform template for example? Does it run?
If not, then the problem is either a badly installed version of Construct 2, in which case, re-download and re-install, or it is rubbish display drivers.
If you have a problem and require help, always give as much information as possible, such as system used, browsers tried etc. Also provide the .capx that is causing the problem (if just one) so others can test it for you.
If your vision so exceeds your ability, then look to something closer.