Hi Apple Community,
I have recently bought an iPhone 6+ and now I'm trying to setup the iTunes in my Windows laptop. I had downloaded the iTunes from the download link provided by Apple and completed the installation. When I try to key in the AppleI there are some unknown error as below. There are also unknown error like error (-50).

I have googled for answers, some say it's because of the Window firewall has blocked the app but when I checked, it shows iTunes is allowed. I have also tried un-installing and install but the issue still persist.
I hope I can get a solution for this.
Thank you.
Regards
Isaac