IPv6 Problems with Home Network

Hello my friends, first time posting here at sevenforums, but a long time resident in the field, particularly networking.

I apologize if the title of this thread is cryptic, but as I have less than zero experience working with ipv6, I was completely unsure of what to call it - but here goes.

The Deets: Two machines at my ex-girlfriend's parents house - Toshiba Satellite Laptop running 7 Home Premium, with realtek network adapter - 32bit os. The other is a dell all-in-one touchscreen thing running 8. I apologize that I don't have more accurate and detailed specs - but I am not on site at the moment.

The Network: Hughesnet Gen4 on the ISP end, with a Cisco/Linksys black trapezoid (wrg54 maybe) for wifi.

I am aware that vista and above default to ipv6 if available, but always fall back on ipv4. The windows 8 machine is operating just fine, but seems to be only running ipv6, as via ipconfig - the v4 address it has is not conducive with the router's dhcp scheme. Again, I apologize - as a print screen would be lovely right about now. (It may or may not be important to note that the 8 machine is hard-wired into the router's ethernet switch, and when I arrived today, it was plugged into the router's 'internet' port instead of the switch, after fixing that minor issue, it operates exactly the same)

The windows 8 machine does have a Teredo Tunneling Pseudo-Interface configured with an ipv6 address, but the others are not showing anything other than media disconnected. This is the only discrepancy between this machine and the laptop running 7HP. It doesn't have the teredo interface configured.

The laptop running windows 7 refuses to connect to or ping about anything. Oddly, google and facebook can be browsed to and pinged just fine, it resolves them as ipv6 in ping. So as that occurred, I figured that maybe there was an issue with the DNS - so I plugged in google's 8.8.8.8 for the v4 dns server, and it's v6 servers on the ipv6 settings. This resulted in no change, still unable to resolve the vast majority of hosts. Disabling ipv6 from the adapter properties - and relying on only ipv4, and the result is this: limited or no connectivity, even though the router is pushing ipv4 addresses via dhcp, and the router is using google's DNS server. (Having said that, the most interesting thing is that the router is old enough that it doesn't support ipv6)

I have - through my google searches, discovered a few registry hacks that force disable ipv6, but those have been unsuccessful. I re-installed the teredo adapter , and qualified it via netsh, with no change again.

Steps I haven't taken yet include downloading up-to-date drivers for network adapter (which I will do tonight while off-site) and flashing the router with a 3rd party option supporting ipv6.

So far as I can tell, I'm not sure what route to follow here otherwise. If anyone has experience with a situation like this - please let me know. Any advice would be greatly appreciated, and I shall gather more diligent data/information/screens tomorrow when back on-site.