Re: WiFi connectivity to 'foreign' neworks connects but refuses internet connection.
I suspect that if they are not defined as private (home / work) you will likely find that the windows firewall maybe preventing internet access. You may want to take a look and see how the firewall is handling applications such as internet browsers.
Open the network and sharing center and see if the network is in fact public / guest.
Then from there click the link to the Windows Firewall bottom left.
Then in the left column click the link "Allow an app or feature through Windows Firewall
And compare what is being allowed with respect to private versus public
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