It is really hard to troubleshoot without the information that you removed from the output of ipconfig /all. Can you at least tell us the beginning parts of the addresses in there?
Without addresses here is my read of the output:
Windows IP Configuration - Standard top level stuff
PPP Adapter NET - OK this matches running a PPPoE connection directly on Windows rather than having a broadband router doing it. It has IPv6 and Link-local IPv6 so you have IPv6 connectivity. Depending on what the IPv4 address shows then there may be IPv4 connectivity as well.
Tunnel adapter isatap - This is worrying to me. ISATAP is a means of getting IPv6 working when you are on an IPv4 network, but you have IPv6 direct connectivity according to the output of PPP Adapter NET.
Tunnel adapter - Again worrying as you have direct connectivity but this seems to be the preferred IPv6 network. I'm wondering if this is a tunnel to a VPN or something else? Or is this how Windows does ISATAP?
Can you try checking your connectivity by going to http://test-ipv6.com and see if it reports 10/10 for both IPv4 and IPv6?
With IPv6 and tunnels I'm wondering if you are having issues with MTU/MSS and it eventually starts working once PMTUD completes. http://test-ipv6.com will test for this as well as DNS connectivity.