Well, I would think the following two lines are suspect:
netsh interface ipv6 add v6v4tunnel interface=IP6Tunnel localaddress=192.xxx.x.xxx remoteaddress=188.8.131.52
IPv4 Address. . . . . . . . . . . : 192.xxx.x.xxx
While I don't know the full details of 6in4, I'm not sure how well it will work through the NAT firewall.
You might try seeing if you can configure the tunnel directly on the TP Link router.
You might try securing your windows box and plugging it straight into the internet connection. (This might at least let you get to the next step...)
you might try putting your 112.xxx.xxx.xxx address in the localaddress= value. [guessing]
(I stayed stuck at Explorer for 2 years on this issue. Then I tried 6to4 and was Sage within two days.
Edit: strike wrong suggestion.