Ok we have to try to see if it is a host file that is blocking. Make a back up before trying this.
Go to this file and follow instructions
You can find your Hosts file in C:\WINDOWS\system32\drivers
"Open With" Notepad and remove all entries below this line:
Save the file but ensure that you use the drop-down box in Save As Type and choose All Files otherwise it will add a .txt extension. The Hosts file does not have an extension.