I have to add https to see the tv listing in any of my browsers in windows 10

I have 4 computers each have installed the latest versions of windows 10 3 have no problem seeing the tv listings from comcast at http://xfinitytv.comcast.net/tv-listings but the newest one from DELL can not I have to add https:// to the url above. Then all comes in fine. I have Norton but also I removed Norton and even then it still did the same thing I get the following message

Please refresh the page to display your TV lineup.

REFRESH PAGE

After I refresh the page I get the following responce:

We're working to fix this problem and hope to have it solved very soon. Please try back at a later time.

But this only happens on this one computer and not the other 3 of course they are not dells I called dell and they said it was either becasue I did not have the correct date or the virus program Which is dumb then dumb as I have the correct date and also to out the virus program and even disabled the firewall and still nothing. If I go to change the line up I get this:

Enter your zip code