If none of the above works, then disable/uninstall any Anti-Virus or Security Software you are running and see if that makes a difference. This has worked for me soooo many times when suddenly I can't access a website. Try it ... it doesn't seem like it will work, but it does so many times. Malwarebytes is usually the problem for me.

Use Revo Uninstaller to completely remove:http://www.revouninstaller.com/