It is looking like that some other program which is running behind the system and preventing the installer from working. And the error which is causing this it is 0x80070643 and its source is wllogin-amd64. And in my computer Windows firewall is on. And I get this bug with the online and offline installers. In order to get rid from this I have tried everything but still I am not able to remove remnants of previous Live installations. I am running windows 7 64 bit as an operating system.